Eidolon (Final Fantasy XIII)

:For videos, see: Eidolon (Final Fantasy XIII)/Videos.
Eidolons are the summons in Final Fantasy XIII that also appear in one form or another in Final Fantasy XIII-2 and Lightning Returns: Final Fantasy XIII. They are creatures created by the goddess Etro to serve as her emissaries in the visible world. Their spirits are locked within crystals known as "eidoliths".
==Datalog==
===Final Fantasy XIII===
;History and Myth – Eidolons
These mystical entities reveal themselves before only to a select few l'Cie. It is said that they are saviors, come to rescue hopeless l'Cie who find themselves bound to a Focus against their will. If this is true, they offer a brand of salvation few indeed would seek willingly: without exception, Eidolons attack the l'Cie whose presences they grace. There have been no l'Cie in Cocoon for centuries, and as a result, no way of determining the truth behind tales of these beings. To the citizens of Cocoon, they remain the stuff of bedtime stories.
;Analects – Her Providence
Her Providence sought nothing.
:Her Providence made nothing.
She but looked on, silent in Her sorrow.
:The Goddess pitied mortals, destined as they were to die, and so She deigned to intervene in the hour of their greatest peril. She averted cataclysm that was to be, and put to rest the ones who would have robbed so many of what time fate had ordained.
Her compassion did not end at this.
:The Goddess pitied also those subjected to that fate of Focus, crueler still than death. To them She sent Her messengers, to deliver hope when all was lost.
—Sermons of the seeress Paddra Nsu-Yeul
===Final Fantasy XIII-2===
;Society – Summoning
Serah's ability to summon monsters is another power born from chaos. The summoner seals defeated creatures in crystals, and call them forth when needed. The weak serve the strong—it is the law of the Unseen Realm that binds the summoned monsters to the will of their master.
Some l'Cie command Eidolons, and the underlying principle is similar. The difference that sets this new power apart, however, lies in the ability to acquire multiple monstrous allies. In her dream, Serah saw Lightning leading an entire army of beasts, and this is likely a more powerful version of the same ability.
==Fragments==
===Final Fantasy XIII-2===
;Crimson Memories – Gerhilde's Blossom
Eidolons are beasts that dwell in Valhalla. L'Cie chosen by Etro are pitted against Eidolons in a trial by combat. Those who emerge triumphant receive a crystal called 'eidolith,' which they may use to summon the beast to fight at their side.
The weak must obey the strong. This is the inviolable law of Valhalla. Like any other denizen of the Unseen Realm, Eidolons are bound to answer every call of their master.
==Profile==
The Analects on the goddess Etro suggest that Eidolons are created by her and are her messengers, "to deliver hope when all was lost". The Eidolons' connection to Etro is shown by having her script written across their bodies and during their summon animations. The Eidolons' nature as mechanical beings confers with the similar beings of fal'Cie, as well as the gods of Final Fantasy XIII universe, of which at least Pulse and Bhunivelze are shown to be mechanical in appearance as well.
As revealed in Final Fantasy XIII-2 and Final Fantasy XIII-2 Fragments After, various Eidolons reside in Valhalla, the middle world between the world of the living and the unseen realm of the dead. They follow Odin, as the rules established in Valhalla dictate that they must obey those stronger than themselves. As such, when an Eidolon manifests in response to a l'Cie on the verge of despair, it forces the human to fight it. Once defeated, an Eidolon becomes a loyal follower to the l'Cie and provides an eidolith, a uniquely shaped crystal that enables the Eidolon to be summoned by its master. Fragments After states that Eidolons communicate with their masters via telepathy.
Though normally summoned by a l'Cie, the people of Paddra devised a means to summon Eidolons via incarnate summoning, where a l'Cie summons their Eidolon, but instead of manifesting it as a partner in battle, they manifest it within their own body, causing the two to permanently fuse. The resulting being is drastically more powerful, but the technique is said to kill the summoner. The only known user of this form of summon is Caius Ballad who used it to fuse with Bahamut. Incarnate summoning is rare, as using it is at the cost of the summoner's life; Caius is an exception, as he was saved by goddess Etro who gave him the "Heart of Chaos" to make him immortal.
==Story==
===Final Fantasy XIII===
left|thumb|Fang summons Bahamut.
When Lightning and her companions are branded l'Cie, Etro sends an Eidolon to each of them when they falter on their path. 
In Lake Bresha, shortly after the party's branding, Snow is the first to earn his Eidolon, Shiva, when he remained behind to rescue Serah in crystal stasis and was confronted by PSICOM. Lightning is tested by Odin in the Vile Peaks when she grows frustrated with Hope for being a burden to her. Sazh summons Brynhildr for the first time in Nautilus after learning the truth about Vanille and her indirect role in branding Dajh a l'Cie.
In the Fifth Ark, Fang is tested by Bahamut when she disagrees with her teammates on how to fight their Focus. Hope battles Alexander in the Vallis Media after he laments his weakness and inability to go on. Lastly, Vanille must face Hecatoncheir in the Mah'habara Subterra after Fang coerces her to admit the truth about Fang's forgotten memories.
When Snow rescues Lightning and Hope in Palumpolum, he summons Shiva to help incapacitate the enemy soldiers. Upon entering Gran Pulse from Cocoon for the first time, the party's airship is destroyed by a wyvern, but Lightning helps Fang summon her Eidolon, Bahamut, and the party rides him down to the surface. When the party returns to Cocoon they inadvertently crash into a grand prix in Eden, and ride it out with their Eidolons in Gestalt Mode. After Ragnarok crystallizes Cocoon the party enters crystal stasis, and upon being released from it by Etro, they find their l'Cie brands wiped clean with their ability to summon Eidolons no longer available.
===Final Fantasy XIII-2===
When Lightning is dragged into Valhalla by chaos, she encounters Odin and defeats him to renew their partnership while forging a new one with Bahamut. As Etro's champion, Lightning utilizes an army of monsters, several Eidolons included, to battle Caius's army of Rift Beasts. Shiva is summoned early on in the battle with Caius, while Lightning rides Odin into the fray. She summons Bahamut to rescue Noel, who is tasked by Lightning to find her sister, Serah. Noel and Serah depart on a quest across the timeline to reunite with Lightning, and while in Yaschas Massif 01X AF, a reseracher mentions that records of magic and sorcery were found in the Paddra Ruins, including a spell to summon Eidolons. It was a forbidden art, as it shortened the conjurer's lifespan.
In the Vile Peaks in 010 AF, a paradox occurs and takes the form of Twilight Odin, created from the memories of Lightning and Hope fighting the real Odin in that location. Although it is visually identical to the genuine Eidolon (save for its color scheme), Serah observes that it lacks "human thoughts or emotions".
Caius is an immortal l'Cie with the ability to transform into Chaos Bahamut, and opposes both Lightning and Odin, as well as Serah and Noel in this form. Odin stays by Lightning's side until the end, and she sends the steed to aid Noel and Serah once the two find their way to Valhalla to defeat Caius once and for all.
===Lightning Returns: Final Fantasy XIII===
After Caius's scheme to kill Etro succeeds, Lightning awakens in Nova Chrysalia 500 years later and finds herself unable to summon Odin. Odin endures in the form of a white chocobo known as the Angel of Valhalla that Lightning nurses back to health after saving the injured bird from a Chocobo Eater prior to learning of Odin's condition from Yeul. Caius retains the ability to summon Chaos Bahamut, though he does not perform an incarnate summoning. The Eidolons aid their former allies in the final assault on the god Bhunivelze (Brynhildr accompanies Noel as Sazh is not present), and after the end of time and the beginning of a new, god-free universe, the Eidolons disappear to reincarnate, bidding farewell to their former masters.
==Gameplay==
===Acquiring===
Usually appearing when a l'Cie is in deep despair, an Eidolon arises to battle its l'Cie, casting Doom on its respective summoner at the battle's start. The goal is not to deplete its HP, but to fill its Gestalt Gauge within the allotted time.
Even if the Eidolon's Libra page lists different methods for raising the Eidolon's Gestalt Gauge depending on the Eidolon (namely, the actions available from the party leader's default paradigm roles), all of the Eidolons' Gestalt Gauges do, in fact, raise by exactly the same measures. Therefore, using the party leader as a Synergist will boost any Eidolon's Gestalt Gauge, even if it is mentioned only for Brynhildr and Alexander (because Synergist is one of Sazh and Hope's primary roles). However, as the Eidolons are battled early enough in the game for the characters to unlikely have explored Crystarium trees other than their primary roles, this factor is insignificant.
;Methods to raise the gauge
Summon multipliers:
Summon 	Multiplier
Shiva 	1.00
Odin 	1.45
Brynhildr 	0.60
Bahamut 	1.40
Alexander 	0.84
Hecatoncheir	0.90
The party leader's role is the most important factor when it comes to calculating the Gestalt Gauge increase. The increase in Gestalt Gauge is calculated as percentages.
Role 	Action 	%Increase in Gestalt Gauge
Commando 	Raise the enemy's chain bonus with a command ability. 	Chain Bonus increase * 0.6 * 7.5 * Summon Multi.
Ravager 	Raise the enemy's chain bonus with a command ability. 	Chain Bonus increase * 0.6 * 1.5 * Summon Multi.
Sentinel 	Raise the enemy's chain bonus with a command ability. 	Chain Bonus increase * 0.6 * Summon Multi.
Sentinel 	Receive damage from an enemy attack. (see chart below)	ATB cost of ability * 10 * [(enemy level / 100) / 10] * Summon Multi.
Saboteur 	Raise the enemy's chain bonus with a command ability. 	Chain Bonus increase * 0.6 * 1.5 * Summon Multi
Synergist	Use a command ability 	2 * Summon Multi
Medic 	Use a command ability 	ATB Cost * 0.75 * Summon Multi
All allies can do to contribute toward the Gestalt Gauge fill is to raise the enemy's chain bonus with command abilities. The allies' Gestalt Gauge Increase % is calculated as: Chain Bonus increase * 0.6 * Summon Multi.
The Sentinel role boosts the Gestalt Gauge by being attacked by the Eidolon while the Sentinel is using its counterattack and defensive commands. The following chart illustrates by how much the gauge fills when the Eidolon attacks a party leader who is using a Sentinel ability. Because the party leader in battles against Odin and Brynhildr can't be a Sentinel, they are not included in the below chart.
Eidolon 	Action 	Gestalt Gauge Increase
Shiva 	Wheel Grind 	18.31%
Shiva 	Pirouette 	18.31%
Shiva 	Curaga 	0.00%
Shiva 	Other 	0.49%
Bahamut 	Ignis 	4.15%
Bahamut 	Other 	1.38%
Alexander 	Explosive Fist	2.49%
Alexander 	Other 	0.83%
Hecatoncheir	Quake 	3.56%
Hecatoncheir	Other 	0.89%
On Easy Mode, the Gestalt Gauge fills significantly quicker.
===Battles===
====Final Fantasy XIII====
=====Shiva=====
thumb|Snow fights the Shiva Sisters.
Stiria and Nix are faced by Snow in Lake Bresha. The battle commences after the point of view returns from Lightning's party to Snow, who has remained behind. He is apprehended by PSICOM, and when surrounded inadvertently summons Shiva. After the Shiva Sisters have annihilated the PSICOM forces, the sisters turn against Snow, who must defeat them to tame them.
Since Snow fights his Eidolons alone, Stiria cannot be targeted during the fight, but instead heals Snow as he has no other support. Shiva Sisters "yield to those who defend against attacks", so the simplest method of victory is to Paradigm Shift to Sentinel, and repeatedly use Steelguard just as Nix is about to attack Snow.
=====Odin=====
Odin is fought by Lightning and Hope in the Vile Peaks. The battle commences in the Scavenger's Trail area when crossing a bridge. Hope stumbles and Lightning loses her patience with him, unwittingly summoning Odin, who, upon identifying him as the source of Lightning's frustration, turns against Hope. But Lightning defends Hope from him, and the two battle the Eidolon together.
Odin is an aggressive Eidolon, initially targeting Hope with physical attacks and Thundara. Lightning can satisfy Odin by building chain bonuses and healing, and Lightning will need to do both, as Odin's strikes will necessitate healing greater than Hope alone can supply. Odin will often guard with Ullr's Shield, allowing for either a break to heal or an uninterrupted attacking phase.
=====Brynhildr=====
Brynhildr is fought by Sazh and Vanille in Nautilus Park The Fiendlord's Keep area, where Brynhildr manifests as a result of Sazh and Vanille's confrontation escalating. Brynhildr attacks with fire attacks that hit both Sazh and Vanille. The key to winning the battle is employing Sazh as a Synergist and only switching to offensive roles when all buffs he has available are in place.
=====Bahamut=====
Bahamut is fought by Fang, Lightning and Vanille in the Fifth Ark's final area called The Apse, where Fang turns against the party when they plan to defy their Focus, inadvertently summoning Bahamut. Bahamut is an aggressive Eidolon, initially targeting Fang with physical attacks followed by Whirlwind on the party. Fang can appease Bahamut by fighting as a Saboteur and switching to Sentinel to guard against Bahamut's strongest attacks.
=====Alexander=====
Alexander is fought by Hope, Lightning, and Fang in the Vallis Media Fingers of Stone area, after finding Hope passed out at the north end and bringing him back to the camp. As Hope loses his drive to continue and asks the others to go on without him, he unwittingly summons Alexander, who turns against him, but Lightning and Fang rush to his aid. Hope can win against Alexander by acting as a Synergist and healing the party when they are on low HP, and acting as a Ravager during times no support is needed.
=====Hecatoncheir=====
Hecatoncheir is fought by Vanille and Fang in the Mah'habara Subterra's Flower-filled Fissure. The battle commences after entering the area when Vanille and Fang talk about their role in the War of Transgression and Fang discovers Vanille has been lying to her ever since they woke up from crystal stasis. Vanille's emotional turmoil calls forth her Eidolon, and he attacks the pair. Fang should remain as a Sentinel for most of the battle, leaving Vanille to debuff as a Saboteur and heal and use Ravager when neither are needed. When Hecatoncheir is charging, the party can use offensive paradigms, but Fang should switch to Sentinel when he starts attacking.
====Final Fantasy XIII-2====
Serah and Noel are not l'Cie and thus do not obtain Eidolons, but "dark" versions of Odin and Bahamut are battled as bosses.
=====Twilight Odin=====
Twilight Odin is fought twice by Serah and Noel in the Vile Peaks, once in 10 AF and and once in 200 AF. The battle commences after approaching a cloud of chaos present in the area. The key to defeating him is Staggering him quickly. In the first battle Twilight is susceptible to status ailments after being staggered, but in the second battle debuffs hit him since the start.
Once Twilight Odin is defeated in the Vile Peaks 200 AF he will join the player party as a Commando.
=====Chaos Bahamut=====
Chaos Bahamut is fought twice: once as part of the main storyline and once as part of the pregame tutorial. Chaos Bahamut is also fought in the DLC episode "Lightning's Story: Requiem of the Goddess". The tutorial battle is made easy, but Chaos Bahamut may prove a formidable opponent in his other boss appearances. Chaos Bahamut is fought at the end of the Academia 500 AF scenario where he has two forms. At first he simply hovers before using Metamorphosis, upon which he becomes a flying mechanical wyvern. In its normal form, it will utilize physical attacks in sets of two, and after changing between forms he uses magic attacks, such as Megaflare. The best way to counter Chaos Bahamut's onslaught of powerful attacks is to deploy Sentinels.
Lightning rides Odin in the tutorial battle in the prologue, and can use abilities reminiscent of Odin's summon abilities from Final Fantasy XIII: Ullr's Shield and Lightning Strike. Despite the abilities sharing names they are not the same as the abilities, as Ullr's Shield is now a healing skill and Lightning Strike is more akin to a regular Thunder spell.
===Summoning===
Eidolons are summoned by spending three TP. They fight alongside the summoning party member in battle while the other members temporarily leave. At this time no role bonuses are contributed by the allies who have left the battle. The summoner is briefly invincible during the summon animation, making it a strategic asset; the party can survive a deadly attack if summoned at the right time.
The time at which the Eidolon can stay is determined by its SP gauge, which drains as time passes and also decreases whenever the Eidolon receives damage. The summoner has a Gestalt Gauge, which increases in the same way as how it increased when the player battled against that Eidolon. The gauge is quickly drained when the Eidolon runs out of SP. When both the SP and the Gestalt Gauges are reduced to zero, or if the summoner is knocked out, the Eidolon will be dismissed. Regardless, it will cast Arise before leaving, fully healing the summoner.
One can activate "Gestalt Mode" , to have the Eidolon change into a form the player can ride, shifting the battle to a more action-oriented tone in which button inputs correspond to attacks. While in Gestalt Mode, enemies will stop attacking and cannot damage the summoner. Gestalt Mode's duration is determined by how high its Gestalt Gauge was when Gestalt Mode was initiated, and each attack subtracts a certain number of points from the gauge. Each Eidolon has a concept that defines their actions in battle.
The Eidolon's finisher consumes all points left in the gauge. The finisher has three levels, with higher levels increasing chain gauges by a larger amount, thus dealing more damage. The level is determined by how much the player managed to increase the Gestalt Gauge during the time the Eidolon is summoned. Once Gestalt Mode ends, enemy chain gauges will be reset.
Nearly all Eidolon attacks during Gestalt Mode ignore physical and magical resistances, and all elemental attacks in both normal and Gestalt Mode will ignore any elemental resistances that benefit the enemy. Eidolons can naturally break the damage limit, even if a character does not have a Genji Glove accessory equipped, allowing the player to earn the Limit Breaker trophy/achievement without one.
When an Eidolon is dismissed, regardless of whether it entered Gestalt Mode or not, all party members will be fully healed, making summoning useful as a last resort.
====Rank====
The Eidolon's rank determines its stats when summoned to battle. The rank is the sum of the character's Crystarium level and the number of level 5 roles. Thus the maximum rank is 16 (Crystarium level 10 + all roles at level 5).
====SP====
The Eidolons are given a base 50 seconds from the moment of summoning. The time they can stay is displayed as the SP gauge. The full SP gauge is equal to 50 seconds no matter how much SP the Eidolon actually has. When summoned to battle the Eidolons don't have an HP gauge, instead, any sustained damage is depleted from the SP gauge reducing the time the summon can stay and battle. If an Eidolon with 10,000 SP takes 1000 damage, it has lost 1/10th of its max SP, or 5 seconds of time. If the Eidolon has 50,000 SP, it has only lost 1/50th of its max SP or just 1 second.
====Gestalt Gauge====
The Gestalt Gauge starts half full. The method to raise the gauge is the same as the method to raise it during the battle against the same Eidolon, except the summon multipliers are ignored. The Gestalt Gauge determines the number of moves the summoner can perform in Gestalt Mode, as well as the level of the Eidolon's finishing attack. If the Eidolon's SP gauge completely depletes, the Gestalt Gauge will begin to drain at a rate of 20% each second. This will decrease the Gestalt Count, even beyond 50%. On Easy Mode, the final Gestalt Count is increased by roughly 50%.
In Gestalt Mode, as long as at least two time units remain, any action can be performed. Abilities that cost more than the remaining number of time units will leave the player with one unit, and the only ability that can be performed at that point is the finisher. If the player waits too long to perform an action, one time unit will be expended with no action performed; if the expended time unit is the last one, the Eidolon will depart without performing their finisher. Poison will continue to deal damage during Gestalt Mode, but its duration will be paused. During finisher attacks, the opposite is instead true.
 	50%	60%	70%	80%	90%	100%
Gestalt Count 	16 	19 	22 	25 	28 	30
Finishing Move Level	1 	1 	1 	2 	2 	3
==List of Eidolons==
Each party member has their own Eidolon. When including Eidolons, and counting the Shiva Sisters separately, there are thirteen total party members.
===Shiva===
The Shiva Sisters, Stiria and Nix, are Snow's Eidolons, obtained in Lake Bresha. They have their own separate ATB gauges, but both will be dismissed if their shared SP falls to zero.
In normal mode, Stiria focuses on the Medic and Ravager roles, healing Snow and dealing Ice-elemental damage on the enemies. Nix focuses on a Commando role, as her abilities are physical based, although she has Blizzara at her disposal. While Stiria cannot be targeted by enemies, she can still be damaged by wide area attacks.
Snow's Gestalt Gauge increases by driving up enemy chain gauges and by defending against enemy attacks. In Gestalt mode, the sisters transform into a motorcycle. Their concept is Rapid Blaster. While in Gestalt Mode only Stiria's stats are used in the damage calculations.
A different variation of the Shiva Sisters return in Final Fantasy XIII-2, supporting Lightning in her fight against Caius to protect Valhalla. They were planned to appear in a DLC episode where Snow would ride the motorcycle on the Archylte Steppe, but this idea was scrapped.
===Odin===
Odin is Lightning's Eidolon, obtained in the Vile Peaks. He is lightning-elemental and has many powerful and diverse physical and magical attacks. He acts as a Sentinel, drawing all enemy attacks.
Lightning's Gestalt Gauge increases by driving up enemy chain gauges and by healing herself and removing status ailments. In Gestalt mode, Odin transforms into the horse Sleipnir, named after Odin's horse in Norse mythology. His concept is Multi-Attacker. Odin's sword is known as Zantetsuken and splits in two for Lightning to wield while riding Sleipnir.
In Final Fantasy XIII-2, Odin still serves as Lightning's Eidolon and aids her in fighting Chaos Bahamut. Some of the abilities used by Lightning are named after the abilities from Final Fantasy XIII, but they are not the same abilities. These are Lightning Strike and Ullr's Shield.
A corrupted variation of Odin, named Twilight Odin, appears in the Vile Peaks in the years 10 and 200 AF as a physical manifestation of chaos, using the memories of Lightning's summoning in the area years ago as a source of energy. He is fought as a boss in both areas and can be recruited as a Paradigm Pack monster for the party. Twilight Odin is also a rare drop of the level 99 Valfodr, this being the only other way of obtaining his monster crystal, aside from defeating him in the Vile Peaks -200 AF-.
In Lightning Returns: Final Fantasy XIII, what happened to Odin is revealed after doing the main quest in the Temple of the Goddess. Odin also appears to help Lightning at the end when she calls out for help.
===Brynhildr===
Brynhildr is Sazh's Eidolon, obtained in Nautilus Park. By default, Brynhildr is Fire-elemental, but Sazh can bestow En-spells on her to change her elemental characteristics. Brynhildr is strong physically, but also has a wide array of spells based on which enhancements Sazh has cast on her.
Sazh's Gestalt Gauge increases by driving up enemy chain gauges and by augmenting himself and Brynhildr with status enhancements. In Gestalt mode, Brynhildr transforms into a race car with side mounted machine guns. Her concept is Gadget Master.
Brynhildr does not make an appearance in Final Fantasy XIII-2, but concept artwork for a blue variation has been shown in the Final Fantasy XIII-2 Ultimania Omega, suggesting she was once considered as one of the Eidolons seen in Valhalla.
In Lightning Returns: Final Fantasy XIII, Brynhildr appears to help Lightning at the end when she calls out for help.
===Bahamut===
Bahamut is Fang's Eidolon, obtained in the Fifth Ark. Bahamut uses powerful non-elemental attacks, and his high attacking stats and speed make him the Eidolon with the highest damage-dealing potential. As Bahamut's SP is rather low, it may be a good idea for Fang to assume the role of Sentinel to increase the summoning time as well as to boost Bahamut's Gestalt Gauge whenever Fang is attacked while blocking.
Fang's Gestalt Gauge increases by driving up enemy chain gauges, defending against attacks and inflicting status ailments upon enemies. In Gestalt mode, Bahamut allows Fang to ride him. His concept is Aerial Raver.
In Final Fantasy XIII-2, while Lightning is able to summon Bahamut, Caius can transform into a variation of Bahamut called "Chaos Bahamut" that is fought numerous times.
===Alexander===
Alexander is Hope's Eidolon, obtained in Vallis Media. Like Bahamut, Alexander uses strong non-elemental attacks, but they are all physical. Alexander draws in all enemy attacks and has the highest starting SP, but he is slow moving around the battlefield and takes longer to act than the other Eidolons, in some cases being late in healing Hope.
Hope's Gestalt Gauge increases by driving up enemy chain gauges, bestowing status enhancements, removing status ailments, and restoring HP. In Gestalt mode, Alexander transforms into an immobile fortress hugging one edge of the battlefield. Whenever Alexander is summoned, executing gestalt or unleashing his final gestalt attack, a somewhat faint, angelic organ pipe can be heard. His concept is Tactical Commander.
Alexander does not make an appearance in Final Fantasy XIII-2, but concept art for it exists, and is included in the Final Fantasy XIII-2 Ultimania Omega guide book.
===Hecatoncheir===
Hecatoncheir is Vanille's Eidolon, obtained in Mah'habara Subterra. Hecatoncheir is Earth-elemental and is the only Eidolon that possesses the Quake ability. He is also the only Eidolon that doesn't have Curaga, meaning Vanille must heal for herself.
Vanille's Gestalt Gauge increases by driving up enemy chain gauges, inflicting and removing status ailments and restoring HP. In Gestalt Mode, Hecatoncheir transforms into a bipedal mech with four machine gun turrets. His concept is Shooting Blaster.
==Other Eidolons==
During the Pompa Sancta parade at Nautilus a number of Eidolons appears to enact a version of the War of Transgression, of the Sanctum l'Cie defeating Ragnarok. Before the parade Sazh comments, "They're putting Eidolons on a parade".
These Eidolons are vastly different from the ones the party can summon. They appear organic rather than mechanical, and appear to be only special effect visuals generated for the purpose of the parade that bear allusion to the series's past summons. The Eidolons seen at the parade are Carbuncle, Siren, Ramuh, Ifrit, and Valefor. Although Leviathan doesn't make an appearance, concept artwork for it exists, indicating Leviathan was considered as one of the Eidolons to appear in Final Fantasy XIII.
Valefor FFXIII.jpg|Art of Valefor.
XIII Siren concept art.jpg|Art of Siren.
Siren eidolon.jpg|Siren at Pompa Sancta.
Carbuncle_1.jpg|Art of Carbuncle.
Carbuncle Doll-ffxiii-render.png|Carbuncle doll.
XIII-Ifrit.jpg|Art of Ifrit.
Leviathan_FFXIII.jpg|Art of Leviathan.
Ramu.jpg|Art of Ramuh.
==Musical themes==
When fighting Eidolons, there are three possible battle themes that will accompany the fight. "Eidolons" plays during Snow's battle with the Shiva Sisters, Fang's battle with Bahamut, and Vanille's battle with Hecatoncheir. "Test of the L'Cie" plays during Sazh's battle with Brynhildr and Hope's battle with Alexander. Lightning's battle with Odin is accompanied by "Desperate Struggle" .
"Eidolons" plays in Final Fantasy XIII-2 during the battle with Twilight Odin in Vile Peaks -10 AF-. A new arrangement of "Eidolons" is available in the Dissidia Final Fantasy arcade version.
==Other appearances==
===Final Fantasy XIV===
Odin and Bahamut appear in their Final Fantasy XIII incarnations as part of a series of FATEs linked to Final Fantasy XIII and featuring Lightning as a non-playable battle ally. Bahamut is one of the enemies faced in the FATEs, while Odin appears once more as a summon Lightning can use in battle.http://www.finalfantasy.net/xiii/lightnings-cameo-final-fantasy-xiv-detailed/
===Dissidia 012 Final Fantasy===
thumb|Hecatoncheir summoned.
Brynhildr and Hecatoncheir appear as summons.
Lightning's EX Burst is Gestalt Drive, but she does not ride Odin, although she uses the same attacks when summoning Odin in Gestalt Mode in Final Fantasy XIII: Lightning Strike, Thunderfall, Stormblade, Razor Gale and Zantetsuken.
===Dissidia Final Fantasy NT===
DFF2015 Lightning Strike.jpg|Lightning Strike.
===Dissidia Final Fantasy Opera Omnia===
DFFOO Flourish of Steel.png|Flourish of Steel.
===Pictlogica Final Fantasy===
===Final Fantasy Airborne Brigade===
Some of the Eidolons appear.
;Ability Cards
FFAB Aerial Tackle - Vanille SR.png|Aerial Tackle (SR).
FFAB Dragon Claws - Fang SR.png|Dragon Claws (SR).
FFAB Slash - Sazh SR.png|Slash (SR).
FFAB Steelcrusher - Hope SR.png|Steelcrusher (SR).
FFAB Aerial Tackle - Vanille SR+.png|Aerial Tackle (SR+).
FFAB Dragon Claws - Fang SR+.png|Dragon Claws (SR+).
FFAB Slash - Sazh SR+.png|Slash (SR+).
FFAB Steelcrusher - Hope SR+.png|Steelcrusher (SR+).
FFAB Blast Punch - Hope SSR.png|Blast Punch (SSR).
FFAB Diamond Dust - Snow SSR.png|Diamond Dust (SSR).
FFAB Dragon Claws - Fang SSR.png|Dragon Claws (SSR).
FFAB Explosive Fist - Hope SSR.png|Explosive Fist (SSR).
FFAB Force Projection - Vanille SSR.png|Force Projection (SSR).
FFAB Hurricane Kick - Vanille SSR.png|Hurricane Kick (SSR).
FFAB Inferno - Fang SSR.png|Inferno (SSR).
FFAB Piercing Ray - Vanille SSR.png|Piercing Ray (SSR).
FFAB Pummel - Vanille SSR.png|Pummel (SSR).
FFAB Seismic Strike - Lightning SSR.png|Seismic Strike (SSR).
FFAB Umbral Vise - Fang SSR.png|Umbral Vise (SSR).
FFAB Valkyrian Scythe - Sazh SSR.png|Valkyrian Scythe (SSR).
FFAB Whirlwind - Fang SSR.png|Whirlwind (SSR).
FFAB Blast Punch - Hope SSR+.png|Blast Punch (SSR+).
FFAB Diamond Dust - Snow SSR+.png|Diamond Dust (SSR+).
FFAB Dragon Claws - Fang SSR+.png|Dragon Claws (SSR+).
FFAB Explosive Fist - Hope SSR+.png|Explosive Fist (SSR+).
FFAB Force Projection - Vanille SSR+.png|Force Projection (SSR+).
FFAB Hurricane Kick - Vanille SSR+.png|Hurricane Kick (SSR+).
FFAB Inferno - Fang SSR+.png|Inferno (SSR+).
FFAB Piercing Ray - Vanille SSR+.png|Piercing Ray (SSR+).
FFAB Pummel - Vanille SSR+.png|Pummel (SSR+).
FFAB Seismic Strike - Lightning SSR+.png|Seismic Strike (SSR+).
FFAB Umbral Vise - Fang SSR+.png|Umbral Vise (SSR+).
FFAB Valkyrian Scythe - Sazh SSR+.png|Valkyrian Scythe (SSR+).
FFAB Whirlwind - Fang SSR+.png|Whirlwind (SSR+).
FFAB Explosive Fist - Hope UR.png|Explosive Fist (UR).
FFAB Gaian Salvo - Vanille UR.png|Gaian Salvo (UR).
FFAB Lightning Strike - Lightning UR.png|Lightning Strike (UR).
FFAB Razor Gale - Lightning UR.png|Razor Gale (UR).
FFAB Soaring Uppercut - Hope UR.png|Soaring Uppercut (UR).
FFAB Thunderfall - Lightning UR.png|Thunderfall (UR).
FFAB Zantetsuken - Lightning UR.png|Zantetsuken (UR).
FFAB Aerial Tackle - Vanille UR+.png|Aerial Tackle (UR+).
FFAB Force Projection - Vanille UR+.png|Force Projection (UR+).
FFAB Gaian Salvo - Vanille UR+.png|Gaian Salvo (UR+).
FFAB Lightning Strike - Lightning UR+.png|Lightning Strike (UR+).
FFAB Pirouette - Snow UR+.png|Pirouette (UR+).
FFAB Razor Gale - Lightning UR+.png|Razor Gale (UR+).
FFAB Soaring Uppercut - Hope UR+.png|Soaring Uppercut (UR+).
FFAB Stormblade - Lightning UR+.png|Stormblade (UR+).
FFAB Zantetsuken - Lightning UR+.png|Zantetsuken (UR+).
FFAB Thunderfall - Lightning UUR.png|Thunderfall (UUR).
FFAB Crushing Blow - Lightning UUR+.png|Crushing Blow (UUR+).
FFAB Explosive Fist - Hope UUR+.png|Explosive Fist (UUR+).
FFAB Pirouette - Snow UUR+.png|Pirouette (UUR+).
FFAB Wheel Rap - Snow UUR+.png|Wheel Rap (UUR+).
;Legend Cards
FFAB Dragon Claws - Fang Legend SR.png|Dragon Claws (SR).
FFAB Steelcrusher - Hope Legend SR.png|Steelcrusher (SR).
FFAB Dragon Claws - Fang Legend SR+.png|Dragon Claws (SR+).
FFAB Steelcrusher - Hope Legend SR+.png|Steelcrusher (SR+).
FFAB Blast Punch - Hope Legend SSR.png|Blast Punch (SSR).
FFAB Dragon Claws - Fang Legend SSR.png|Dragon Claws (SSR).
FFAB Flip Kick - Snow Legend SSR.png|Flip Kick (SSR).
FFAB Force Projection - Vanille Legend SSR.png|Force Projection (SSR).
FFAB Pummel - Vanille Legend SSR.png|Pummel (SSR).
FFAB Seismic Strike - Lightning Legend SSR.png|Seismic Strike (SSR).
FFAB Soaring Uppercut - Hope Legend SSR.png|Soaring Uppercut (SSR).
FFAB Umbral Vise - Fang Legend SSR.png|Umbral Vise (SSR).
FFAB Valkyrian Scythe - Sazh Legend SSR.png|Valkyrian Scythe (SSR).
FFAB Whirlwind - Fang Legend SSR.png|Whirlwind (SSR).
FFAB Blast Punch - Hope Legend SSR+.png|Blast Punch (SSR+).
FFAB Dragon Claws - Fang Legend SSR+.png|Dragon Claws (SSR+).
FFAB Flip Kick - Snow Legend SSR+.png|Flip Kick (SSR+).
FFAB Force Projection - Vanille Legend SSR+.png|Force Projection (SSR+).
FFAB Pummel - Vanille Legend SSR+.png|Pummel (SSR+).
FFAB Razor Gale - Lightning Legend SSR+.png|Razor Gale (SSR+).
FFAB Seismic Strike - Lightning Legend SSR+.png|Seismic Strike (SSR+).
FFAB Soaring Uppercut - Hope Legend SSR+.png|Soaring Uppercut (SSR+).
FFAB Umbral Vise - Fang Legend SSR+.png|Umbral Vise (SSR+).
FFAB Valkyrian Scythe - Sazh Legend SSR+.png|Valkyrian Scythe (SSR+).
FFAB Whirlwind - Fang Legend SSR+.png|Whirlwind (SSR+).
FFAB Blast Punch - Hope Legend UR.png|Blast Punch (UR).
FFAB Thunderfall - Lightning Legend UR.png|Thunderfall (UR).
FFAB Wheel Grind - Snow Legend UR.png|Wheel Grind (UR).
FFAB Blast Punch - Hope Legend UR+.png|Blast Punch (UR+).
FFAB Force Projection - Vanille Legend UR+.png|Force Projection (UR+).
FFAB Lightning Strike - Lightning Legend UR+.png|Lightning Strike (UR+).
FFAB Seismic Strike - Lightning Legend UR+.png|Seismic Strike (UR+).
FFAB Stormblade - Lightning Legend UR+.png|Stormblade (UR+).
FFAB Wheel Grind - Snow Legend UR+.png|Wheel Grind (UR+).
FFAB Aerial Tackle - Vanille Legend UUR.png|Aerial Tackle (UUR).
FFAB Explosive Fist - Hope Legend UUR.png|Explosive Fist (UUR).
FFAB Pirouette - Snow Legend UUR.png|Pirouette (UUR).
FFAB Soaring Uppercut - Hope Legend UUR.png|Soaring Uppercut (UUR).
FFAB Crushing Blow - Lightning Legend UUR+.png|Crushing Blow (UUR+).
FFAB Pirouette - Snow Legend UUR+.png|Pirouette (UUR+).
FFAB Wheel Rap - Snow Legend UUR+.png|Wheel Rap (UUR+).
FFAB Razor Gale - Lightning Legend CR.png|Razor Gale (CR).
FFAB Thunderfall - Lightning Legend CR.png|Thunderfall (CR).
FFAB Zantetsuken Lightning Legend CR.png|Zantetsuken (CR).
FFAB Valhalla's Call - Lightning Legend CR+.png|Valhalla's Call (CR+).
;Other
FFAB Odin FFXIII.png|Odin.
===Final Fantasy Record Keeper===
All of the Eidolons appear as enemies. Their abilities, however, may be imparted to the delegation's units as Soul Break skills. For example, Hope has three moves also attributed to his Eidolon, Alexander: Brutal Sanction, Earthquake, and Divine Judgment.
FFRK Alexander FFXIII.png|Alexander.
FFRK Bahamut FFXIII.png|Bahamut.
FFRK Brynhildr FFXIII.png|Brynhildr.
FFRK Hecatoncheir FFXIII.png|Hecatoncheir.
FFRK Nix & Stiria FFXIII.png|Nix & Stiria.
FFRK Odin FFXIII.png|Odin.
===World of Final Fantasy===
Shiva-Ixion, a variant of Shiva based on the Shiva Sisters, appears accompanying Snow. She's one of the few Mirages that can't be imprismed in any way.
===Mobius Final Fantasy===
The Eidolons appear as ability cards.
MFF Gaian Salvo.png|Gaian Salvo.
MFF Megaflare.png|Megaflare.
MFF Zantetsuken.png|Zantetsuken.
Mobius Odin SS.png|Odin
Mobius - Lightning FFXIII R3 Ability Card.png|Lightning FFXIII R3 Ability Card
Mobius - Summon Bahamut R5 Ability Card.png|Summon Bahamut R5 Ability Card
Mobius - Summon Hecatoncheir R5 Ability Card.png|Mobius - Summon Hecatoncheir R5 Ability Card
===Final Fantasy Trading Card Game===
The Eidolons appear as card, representing the same elements they do in Final Fantasy XIII. Bahamut is depicted in the Fire set.
Shiva5 TCG.png|Shiva Sisters.
1-033u - Shiva TCG.png|Snow and Shiva.
Odin TCG.png|Lightning and Odin.
Brynhildr TCG.png|Brynhildr.
1-019u - Brynhildr TCG.png|Sazh and Brynhildr.
1-015s - Bahamut TCG.png|Fang and Bahamut.
Bahamut PR TCG.png|Bahamut.
Alexander3 TCG.png|Alexander.
Alexander TCG.png|Hope and Alexander.
Hecatoncheir2 TCG.png|Hecatoncheir.
Hecatoncheir TCG.png|Vanille and Hecatoncheir.
TwilightOdin TCG.png|Twilight Odin.
Lightning & Snow TCG.png|Lightning & Snow, with the Gestalt Mode ability.
===Final Fantasy Portal App===
The Eidolons appear as Triple Triad cards.
269a Bahamut.png|Bahamut
270a Brynhildr.png|Brynhildr
271a Shiva.png|Shiva Sisters
272a Alexander.png|Alexander
273a Hecatoncheir.png|Hecatoncheir
274a Odin.png|Odin
==Non-Final Fantasy guest appearances==
===Guardian Cross===
==Behind the scenes==
The way summon sequences work in Final Fantasy XIII stemmed from players of older Final Fantasy games not being keen on waiting for the summoning sequence amid a battle to finish to see the damage done. Thus things were mixed up in Final Fantasy XIII: the summon sequences still have flashy effects, but the summoning scenes are short and paired with gameplay. A dummy/placeholder model was used for testing the summons, the model being similar to the êúô0(äñ) enemies of Final Fantasy VII, consisting of a simple, untextured double/sided pyramid.
The idea of transformation was a theme the designers had for Final Fantasy XIII; that's why the Eidolons have two forms, and many of the characters' weapons transform between two forms as well, such as Lightning's gunblade and Sazh's pistols. Final Fantasy XIII Ultimania Omega reveals some ideas the designers had behind the Eidolons. It had been decided that Odin was going to be a horse in the planning stage, and in his normal mode he was made to look like the Joker from a deck of cards. Odin was originally more harsh looking and dark colored, but the developers wanted Lightning to be a knight with a white horse. Since Lightning had lost her parents at a young age, and tried to take their place and raise Serah, Odin was imagined as someone she would project a fatherly image onto. Snow's Shiva Sisters represent the Farron sisters, Lightning and Serah.
The Final Fantasy XIII-2 Ultimania Omega reveals scrapped plans for an extension to Snow's DLC scenario episode titled "Perpetual Battlefield". Alongside the existing part of the episode in the Coliseum, there would have been a separate minigame in which players would play as Snow as he rode through the Archylte Steppe on the Shiva Sisters. The player's objective would have been to try and kill 30 monsters using Snow's skillset—which included being able to spin, drift, jump and use a water-based spell. However, once this part of the DLC was scrapped, this minigame was used as a base for the chocobo racing minigame in Serendipity.
The original plan for the ending of Final Fantasy XIII-2 was for Lightning to sequentially defeat dark Eidolons akin to Twilight Odin, but since the story of needed to come to a close, it "ended up the way it did." In the final game, the game ends with Serah and Noel defeating three Bahamuts, incarnations of Caius Ballad. 
==Merchandise==
T-shirts with Eidolon designs have been on sale in the Japanese Square Enix store. The shirts cost ¥3,900, with two versions, Odin or Shiva. The Eidolons have also been made into action figures in the Final Fantasy Creatures Kai Vol. 3 series. These figures cost ¥6,240 a piece. Final Fantasy XIII -Play Arts Kai- figure of Odin was released in July 2010; it has two forms, Sleipnir or Odin. Final Fantasy XIII -Play Arts Kai- Shiva Bike Action Figure Set with Nix and Stiria was released in November 2010 with the Shiva Sisters, which could either be assembled separately or into a bike as they appear in Gestalt Mode.
Odin shirt.jpg|Odin.
Shiva shirt.jpg|Shiva.
Creatureskai3.jpg|Creatures Kai Vol. 3.
Square Enix Odin PlayArts Kai figure.jpg|Final Fantasy Play Arts Kai "Odin".
Ffxiii styria nix play arts kai.jpg|Final Fantasy Play Arts Kai "Shiva Bike".
==Etymology==
 This alludes to the Eidolon and the l'Cie combining their powers when the latter rides the former.
==See also==
*List of summons
*Summoned monsters
==Citations==
de:Esper (FFXIII)
fr:Eidolon
pl:Eidolon (Final Fantasy XIII)
Category:Eidolons in Final Fantasy XIII
Category:Summons