Final Fantasy X auto-abilities

Unlike command abilities, auto-abilities in Final Fantasy X automatically take effect and can be assigned to weapons and armor, similar to support abilities in previous games.
==Mechanics==
===Ability slots===
Pieces of equipment can have a maximum of one to four auto-abilities. Most equipment have auto-abilities already assigned to them when acquired, but once the player reaches Guadosalam, they can customize auto-abilities onto equipment as long as they have the required number of items, and as long as the equipment has at least one empty slot. Once an ability is added to a piece of equipment, it cannot be removed. Brotherhood, Celestial Weapons, and non-empty-slotted equipment cannot be customized.
On occasion, customizing equipment may change the name and appearance of that equipment. Adding the Firestrike ability to the Variable Steel, for instance, will change its name to Flametongue.
===Sell value===
One can determine the value of a piece of equipment using the formula
(50 + the sum of the ability values) * slots factor * empty slots factor
Where the slots factor is 1, 1.5, 3, or 5, depending on the number of total slots. The empty slots factor uses the same progression, except the last value is 400.
So an empty, 4 slot equipment is (50 + 0) * 5 * 400 = 100000.
The purchase price is some multiple of this total price (post-airship, that is usually 1). The sale price is 1/4th of the calculated value, rounded down to the nearest whole integer.
===Ability mechanics===
In the event multiple auto-abilities with percentages are equipped, the percentages are added together before applying the effect; equipping HP+30% and HP+20% would result in a 50% boost to HP, not 56%. Additionally, apart from HP and MP, these abilities directly affect damage rather than the stat itself. For example, Strength+20% does not increase a unit's Strength stat by 20%, but rather boosts any physical damage dealt by 20%. Thus, Fenrir's physical Fangs of Chaos attack, which is not affected by Strength or Defense, would still be mitigated by Defense+20%. Overdrives are also considered special damage rather than physical or magical, and as such, Strength+20% has no impact on their damage.
Status abilities work in a similar way. Status-touch abilities increase the chance of infliction by 50%, while Status-strike abilities increase it by 100%. If both are together, which can be achieved by customizing the -touch first and then the -strike, the weapon will have a 150% chance of inflicting the status. This can make a difference against enemies with partial resistance to the status. This further combines with the chance that an attack carries; if one has Darktouch and Darkstrike equipped and uses Dark Attack, the result is a 250% chance of inflicting Darkness. There are also attacks that always inflict a status unless the target is immune. Aside from some enemy attacks, the status Buster skills and all status-inflicting items except Farplane Wind carry this property.
Status resist abilities provide a 50% resistance, which is subtracted (not multiplied) from the chance. This means an attack with a 80% chance of inflicting Silence, used on a character with Silence Ward, would have a 30% chance of working (not 40%). Status proof abilities do not give a 100% resistance, but rather "perfect" resistance—no matter how high the infliction chance is, status proofs (and Ribbon) will always protect the unit, unless the attack is one of the few that bypass protection. For the most part, immunity-bypassing statuses cannot be prevented, but there is one exception: protection-bypassing Slow will still be prevented by Auto-Haste (or an active SOS Haste).
Multiple elemental-strike abilities can be customized on the same weapon. When attacking an enemy with such weapon, the game considers each elemental affinity separately, and uses only the one that's the most favorable to the player: weak > neutral > resists > immune > absorbs. If an enemy is weak to multiple elements of the attacker's weapon, the damage is multiplied by 1.5 for each weak element, which results in 1.5, 2.25, 3.375, or 5.06 times damage respectively, which is most useful on Geosgaeno. Other than enemies' weaknesses, the weapon's elements won't have any cumulative effect. An enemy that absorbs multiple elements won't absorb any more HP than it normally would, while resisting multiple elements won't decrease damage below 50%.
Abilities that modify AP or gil gain only work if the user is on the frontline when an enemy is defeated.
===Abnormal equipment===
There are two instances of auto-abilities appearing on equipment they normally do not. When first arriving in the Calm Lands, it is possible to purchase an armor for Tidus that has Magic Counter, an auto-ability otherwise only found on weapons, while the optional boss Geosgaeno outside Baaj Temple may drop a weapon with No Encounters, normally only found on armor. In both cases, these abilities function exactly as they normally would. Auto-abilities always work regardless of being found on weapon or armor, including aeons' equipment.
==Weapon auto-abilities==
Auto-Ability	Description 	Value	Customize Requirement
 	  "View enemy data during battle."Reveals target's current and maximum HP, elemental characteristics, and status effects. 	200 	2x Ability Sphere
 	  "Deal normal damage to armored enemies."Attacks and Skills inflict full damage on Armored enemies. 	0 	1x Lv. 2 Key Sphere
 	  "Act first at beginning of battle."Guarantees the first turn during battle even in an ambush. Enemies with First Strike have priority over party members. 	6000 	1x Return Sphere
 	  "Raises party's chances for a preemptive strike."Increases the chance of a Preemptive Strike and eliminates Ambushes, except against enemies with a 100% ambush rate. 	6000 	6x Chocobo Feather
 	  "Adds fire element to attacks and skills."Adds Fire element to Attacks and Skills. 	700 	4x Bomb Fragment
 	  "Adds lightning element to attacks and skills."Adds Lightning element to Attacks and Skills. 	700 	4x Electro Marble
 	  "Adds water element to attacks and skills."Adds Water element to Attacks and Skills. 	700 	4x Fish Scale
 	  "Adds ice element to attacks and skills."Adds Ice element to Attacks and Skills. 	700 	4x Antarctic Wind
 	  "Sometimes adds darkness to attacks and skills."Attacks and Skills sometimes inflict Darkness on the target. 	2000 	60x Eye Drops
 	  "Almost always adds darkness to attacks and skills."Attacks and Skills inflict Darkness on the target. 	4000 	20x Smoke Bomb
 	  "Sometimes adds silence to attacks and skills."Attacks and Skills sometimes inflict Silence on the target. 	3000 	60x Echo Screen
 	  "Almost always adds silence to attacks and skills."Attacks and Skills inflict Silence on the target. 	8000 	20x Silence Grenade
 	  "Sometimes adds sleep to attacks and skills."Attacks and Skills sometimes inflict Sleep on the target. 	1000 	10x Sleeping Powder
 	  "Almost always adds sleep to attacks and skills."Attacks and Skills inflict Sleep on the target. 	8000 	16x Dream Powder
 	  "Sometimes adds poison to attacks and skills."Attacks and Skills sometimes inflicts Poison on the target. 	1500 	99x Antidote
 	  "Almost always adds poison to attacks and skills."Attacks and Skills inflict Poison on the target. 	10000	24x Poison Fang
 	  "Sometimes adds petrification to attacks and skills."Attacks and Skills sometimes inflict Petrification on the target. 	5000 	10x Petrify Grenade
 	  "Almost always adds petrification to attacks and skills."Attacks and Skills inflict Petrification on the target. 	12000	60x Petrify Grenade
 	  "Sometimes adds death to attacks and skills."Attacks and Skills sometimes instantly kill the target. 	8000 	30x Farplane Shadow
 	  "Almost always adds death to attacks and skills."Attacks and Skills instantly kill the target. 	20000	60x Farplane Wind
 	  "Sometimes adds zombie to attacks and skills."Attacks and Skills sometime inflicts Zombie on the target. 	8000 	70x Holy Water
 	  "Almost always adds zombie to attacks and skills."Attacks and Skills inflict Zombie on the target. 	12000	30x Candle of Life
 	  "Sometimes adds slow to attacks and skills."Attacks and Skills sometimes inflict Slow on the target. 	3000 	16x Silver Hourglass
 	  "Almost always adds slow to attacks and skills."Attacks and Skills inflict Slow on the target. 	7000 	30x Gold Hourglass
 	  "Adds Power Distiller effect to attacks and skills."Monster drops Power Spheres once defeated when struck by Attacks and Skills (International and HD Remaster versions only). 	10 	2x Power Sphere
 	  "Adds Mana Distiller effect to attacks and skills."Monster drops Mana Spheres once defeated when struck by Attacks and Skills (International and HD Remaster versions only). 	10 	2x Mana Sphere
 	  "Adds Speed Distiller effect to attacks and skills."Monster drops Speed Spheres once defeated when struck by Attacks and Skills (International and HD Remaster versions only). 	10 	2x Speed Sphere
 	  "Adds Ability Distiller effect to attacks and skills."Monster drops Ability Spheres once defeated when struck by Attacks and Skills (International and HD Remaster versions only). 	10 	2x Ability Sphere
 	  "Enhances physical attack power by 3%."Increases damage of physical attacks by three percent. 	100 	3x Power Sphere
 	  "Enhances physical attack power by 5%."Increases damage of physical attacks by five percent. 	500 	2x Stamina Spring
 	  "Enhances physical attack power by 10%."Increases damage of physical attacks by ten percent. 	5000 	1x Skill Sphere
 	  "Enhances physical attack power by 20%."Increases damage of physical attacks by twenty percent. 	10000	4x Supreme Gem
 	  "Enhances magic attack power by 3%."Increases the damage of magic attacks by three percent. 	100 	3x Mana Sphere
 	  "Enhances magic attack power by 5%."Increases the damage of magic attacks by five percent. 	500 	2x Mana Spring
 	  "Enhances magic attack power by 10%."Increases the damage of magic attacks by ten percent. 	5000 	1x Blk Magic Sphere
 	  "Enhances magic attack power by 20%."Increases the damage of magic attacks by twenty percent. 	10000	4x Supreme Gem
 	  "Strike back after being physically attacked."Character automatically attacks aggressor if attacked physically. 	4000 	1x Friend Sphere
 	  "Evade physical attack and strike back."Evade a standard physical attack and then automatically attack the aggressor. Even if the evade fails, the counter will still occur. 	22000	1x Teleport Sphere
 	  "Strike back after being attacked with magic."Character automatically attacks aggressor if attacked by magic. 	25000	16x Shining Gem
 	  "Use more MP to heighten spell power."Increases potency of magic spells by 50% but doubles their MP cost. 	17000	30x Turbo Ether
 	  "Doubles the potency of recovery items."Recovery items will heal twice as much. This does not extend to Mixes. 	8000 	4x Healing Water
 	  "Reduces MP cost of spells by half."Halves the MP cost of all abilities. 	20000	20x Twin Stars
 	  "Reduces MP cost of spells to 1."All abilities that require MP will only cost 1 MP. 	30000	20x Three Stars
 	  "Doubles amount of AP earned."Doubles the amount of AP earned. 	40000	20x Megalixir
 	  "Triples amount of AP earned."Triples the amount of AP earned. 	60000	50x Wings to Discovery
 	  "Earn more AP instead of charging Overdrive gauge."Obtain AP instead of charging the Overdrive gauge. 	25000	10x Door to Tomorrow
 	  "Charges Overdrive at double speed when HP is low."Overdrive gauge charges twice the speed as normal while in HP Critical status. 	20000	20x Gambler's Spirit
 	  "Charges Overdrive at double speed."Overdrive gauge charges twice the speed as normal. 	30000	30x Underdog's Secret
 	  "Charges Overdrive at triple speed."Overdrive gauge charges three times the speed as normal. 	40000	30x Winning Formula
 	  "Doubles amount of Gil earned."Doubles the amount of gil earned after battle. 	0 	30x Designer Wallet
 	  "Allows max damage to exceed 9999."Sets the maximum amount of damage and recovery the character deals to 99,999. This does not affect items or most Mixes. Break Damage Limit is not present in the Reference menu of the Help window.	0 	60x Dark Matter
 	Attacks and Skills will capture certain monsters as long as it is the killing blow. 	6000 	—
 	No AP is gained after battle. Celestial Weapons initially have this. 	0 	—
==Armor auto-abilities==
Auto-Ability	Description 	Value	Customize Requirement
 	  "Reduces fire damage by half."Reduces Fire-elemental damage by half. 	1500 	4x Bomb Fragment
 	  "Grants immunity to fire attacks."Protects completely from Fire-elemental attacks. 	3000 	8x Bomb Core
 	  "Converts fire damage to HP."Fire-elemental attacks restore the user's HP, rather than damaging them. 	10000	20x Fire Gem
 	  "Reduces lightning damage by half."Reduces Lightning-elemental damage by half. 	1500 	4x Electro Marble
 	  "Grants immunity to lightning attacks."Protects completely from Lightning-elemental attacks. 	3000 	8x Lightning Marble
 	  "Converts lightning damage to HP."Lightning-elemental attacks restore the user's HP, rather than damaging them. 	10000	20x Lightning Gem
 	  "Reduces water damage by half."Reduces Water-elemental damage by half. 	1500 	4x Fish Scale
 	  "Grant immunity to water attacks."Protects completely from Water-elemental attacks. 	3000 	8x Dragon Scale
 	  "Converts water damage to HP."Water-elemental attacks restore the user's HP, rather than damaging them. 	10000	20x Water Gem
 	  "Reduces ice damage by half."Reduces Ice-elemental damage by half. 	1500 	4x Antarctic Wind
 	  "Grants immunity to ice attacks."Protects completely from Ice-elemental attacks. 	3000 	8x Arctic Wind
 	  "Converts ice damage to HP."Ice-elemental attacks restore the user's HP, rather than damaging them. 	10000	20x Ice Gem
 	  "Sometimes protects against darkness."Offers moderate protection from Darkness. 	500 	40x Eye Drops
 	  "Almost completely protects against darkness."Offers complete protection from Darkness. 	2000 	10x Smoke Bomb
 	  "Sometimes protects against silence."Offers moderate protection from Silence. 	500 	30x Echo Screen
 	  "Almost completely protects against silence."Offers complete protection from Silence. 	3000 	10x Silence Grenade
 	  "Sometimes protects against sleep."Offers moderate protection from Sleep. 	200 	6x Sleeping Powder
 	  "Almost completely protects against sleep."Offers complete protection from Sleep. 	800 	8x Dream Powder
 	  "Sometimes protects against poison."Offers moderate protection from Poison. 	400 	40x Antidote
 	  "Almost completely protects against poison."Offers complete protection from Poison. 	1500 	12x Poison Fang
 	  "Sometimes protects against petrification."Offers moderate protection from Petrification. 	1200 	30x Soft
 	  "Almost completely protects against petrification."Offers complete protection from Petrification. 	2500 	20x Petrify Grenade
 	  "Sometimes protects against death."Offers moderate protection from Instant Death. 	2000 	15x Farplane Shadow
 	  "Almost completely protects against death."Offers complete protection from Instant Death. 	4000 	60x Farplane Wind
 	  "Sometimes protects against zombie."Offers moderate protection from Zombie. 	2000 	30x Holy Water
 	  "Almost completely protects against zombie."Offers complete protection from Zombie. 	4000 	10x Candle of Life
 	  "Sometimes protects against slow."Offers moderate protection from Slow. 	1000 	10x Silver Hourglass
 	  "Almost always protects against slow."Offers complete protection from Slow. 	3000 	20x Gold Hourglass
 	  "Sometimes protects against confusion."Offers moderate protection from Confuse. 	1000 	16x Musk
 	  "Almost always protects against confusion."Offers complete protection from Confusion. 	4000 	48x Musk
 	  "Sometimes protects against berserk."Offers moderate protection from Berserk. 	1000 	8x Hypello Potion
 	  "Almost always protects against berserk."Offers complete protection from Berserk. 	6000 	32x Hypello Potion
 	  "Almost always protects against curse."Offers complete protection from Curse. 	8000 	12x Tetra Elemental
 	  "Casts NulBlaze when HP is low."Imbues NulBlaze while user is in HP Critical status. 	500 	1x Bomb Core
 	  "Casts NulShock when HP is low."Imbues NulShock while user is in HP Critical status. 	500 	1x Lightning Marble
 	  "Casts NulTide when HP is low."Imbues NulTide while user is in HP Critical status. 	500 	1x Dragon Scale
 	  "Casts NulFrost when HP is low."Imbues NulFrost while user is in HP Critical status. 	500 	1x Arctic Wind
 	  "Casts Shell when HP is low."Imbues Shell while user is in HP Critical status. 	4000 	8x Lunar Curtain
 	  "Casts Protect when HP is low."Imbues Protect while user is in HP Critical status. 	4000 	8x Light Curtain
 	  "Casts Reflect when HP is low."Imbues Reflect while user is in HP Critical status. 	1000 	8x Star Curtain
 	  "Casts Haste when HP is low."Imbues Haste while user is in HP Critical status. 	20000	20x Chocobo Feather
 	  "Casts Regen when HP is low."Imbues Regen while user is in HP Critical status. 	20000	12x Healing Spring
 	  "Automatically casts Shell on user."Imbues constant Shell effect that the enemy cannot remove. 	22000	80x Lunar Curtain
 	  "Automatically casts Protect on user."Imbues constant Protect effect that the enemy cannot remove. 	22000	70x Light Curtain
 	  "Automatically casts Reflect on user."Imbues constant Reflect effect that the enemy cannot remove. 	14000	40x Star Curtain
 	  "Automatically casts Haste on user."Imbues constant Haste effect that the enemy cannot remove. Also grants full immunity to Slow. 	50000	80x Chocobo Wing
 	  "Automatically casts Regen on user."Imbues constant Regen effect that the enemy cannot remove. 	60000	80x Healing Spring
 	  "Reduces damage from physical attacks by 3%."Reduces damage taken from physical attacks by three percent. 	200 	3x Power Sphere
 	  "Reduces damage from physical attacks by 5%."Reduces damage taken from physical attacks by five percent. 	500 	2x Stamina Spring
 	  "Reduces damage from physical attacks by 10%."Reduces damage taken from physical attacks by ten percent. 	5000 	1x Special Sphere
 	  "Reduces damage from physical attacks by 20%."Reduces damage taken from physical attacks by twenty percent. 	10000	4x Blessed Gem
 	  "Reduces damage from magical attacks by 3%."Reduces damage taken from magic attacks by three percent. 	200 	3x Mana Sphere
 	  "Reduces damage from magical attacks by 5%."Reduces damage taken from magic attacks by five percent. 	500 	2x Mana Spring
 	  "Reduces damage from magical attacks by 10%."Reduces damage taken from magic attacks by ten percent. 	5000 	1x Wht Magic Sphere
 	  "Reduces damage from magical attacks by 20%."Reduces damage taken from magic attacks by twenty percent. 	10000	4x Blessed Gem
 	  "Raises max HP by 5%."Increases maximum HP by five percent. 	100 	1x X-Potion
 	  "Raises max HP by 10%."Increases maximum HP by ten percent. 	1000 	3x Soul Spring
 	  "Raises max HP by 20%."Increases maximum HP by twenty percent. 	6000 	5x Elixir
 	  "Raises max HP by 30%."Increases maximum HP by thirty percent. 	15000	1x Stamina Tonic
 	  "Raises max MP by 5%."Increases maximum MP by five percent. 	1200 	1x Ether
 	  "Raises max MP by 10%."Increases maximum MP by ten percent. 	6000 	3x Soul Spring
 	  "Raises max MP by 20%."Increases maximum MP by twenty percent. 	8000 	5x Elixir
 	  "Raises max MP by 30%."Increases maximum MP by thirty percent. 	18000	1x Mana Tonic
 	  "Automatically use items to recover HP when damaged."If a character with this ability takes damage that leaves them below half of their maximum HP (even if they were already below it before the attack), they will automatically use the least powerful potion in the inventory. Only Potions, Hi-Potions, and X-Potions are used. 	12000	4x Stamina Tablet
 	  "Automatically use items to cure status ailments."If a character with this ability is inflicted with Darkness, Silence, Poison, or Zombie, they will use Eye Drops, Echo Screen, Antidote, or Holy Water on themselves. A Remedy will be used if multiple status effects are inflicted. Holy Water and Remedy may also inadvertently remove Curse and Slow.	10000	20x Remedy
 	  "Automatically use Phoenix Down on KO'd character."If any ally is KO'd, this user automatically revives them with a Phoenix Down, provided the character with Auto-Phoenix is not also killed by the attack. 	20000	20x Mega Phoenix
 	  "Improves odds of stealing rare items."Increases the chance of stealing rare items from 25% to 50%, decreasing the chance to steal common items. 	40000	30x Amulet
 	  "Steal only rare items."All successful steals from enemies will yield rare items. 	60000	30x Pendulum
 	  "Automatically recover HP while walking."HP gradually increases while walking in the field. 	6000 	2x Stamina Tablet
 	  "Automatically recover MP while walking."MP gradually increases while walking in the field. 	6000 	2x Mana Tablet
 	  "No random enemy encounters."Disables random encounters. 	6500 	30x Purifying Salt
 	  "Allows max MP to exceed 999."Allows maximum MP to reach 9,999. This auto-ability is not present in the Reference section of the Help menu. 	0 	30x Three Stars
 	  "Allows max HP to exceed 9999."Allows maximum HP to reach 99,999. This auto-ability is not present in the Reference section of the Help menu. 	0 	30x Wings to Discovery
 	"Almost completely protects against all status ailments."Offers complete protection from all status ailments except Instant Death, Power Break, Armor Break, Magic Break, Mental Break, Curse, Delay, and Eject (International and HD Remaster versions only). 	5000 	99x Dark Matter
==Aeon auto-abilities==
Aeons also have equipment, though it is not visible in-game. Their weapons contain Piercing, followed by —, and then two empty slots. Valefor lacks Piercing (having — on the first slot), while Bahamut, Anima, and the Magus Sisters have Break Damage Limit in the third slot. Once an aeon's respective Celestial Weapon is upgraded with at least the crest, the first empty slot changes to Break Damage Limit. Their armors do not change; they always contain Sensor, Break HP Limit, Break MP Limit, and a blank slot. The elemental aeons have their respective element Eater between Sensor and Break HP Limit, and Valefor has its second slot empty despite lacking an elemental affinity.
Auto-Ability	Description 	Value	Customize Requirement
 	"—"Offers complete protection from all status ailments (including Instant Death, Power Break, Armor Break, Magic Break, Mental Break, Eject, Distill Power, Distill Mana, Distill Speed, Distill Ability, Scan, Defend, Guard, and Sentinel) except Curse and Delay.	0 	—
==Dummied auto-ability==
An ability unobtainable without a cheat device or save editor exists in the game's code.
Auto-Ability	Description 	Value	Customize Requirement
 	Rather than giving 50% protection against Curse, this functions the same as Curseproof.	0 	—
de:Auto-Ability (FFX)
Category:Auto-abilities in Final Fantasy X
Category:Abilities in Final Fantasy X
Category:Support abilities