Vercingetorix Vercingetorix is the final Cie ' th Stone mission boss in " Final Fantasy XIII " and is one of the Undying . The Cie ' th Stone required to accept the mission is available after beating Missions 27 to 51 , and after beating Barthandelus in Oerba . The Stone is at the end of the broken railway bridge in Oerba , where Barthandelus is fought at the end of Chapter 11 . The Cie ' th Stone and the mark are on the furthest opposing ends of Gran Pulse : Vercingetorix is found in Yaschas Massif Paddraean Archaeopolis . Vercingetorix , along with the Long Gui , can be considered the game ' s superbosses . Battle . Vercingetorix is a flying enemy similar to related enemies Mithridates and Bituitus . He has two wings , but the lower his health the more wings he sprouts . Whenever Vercingetorix reaches one of his HP milestones , 90 % , 60 % and 30 % , it ' ll sprout new wings and grow stronger , especially its Wing Shear attack : with 2 wings it hits 9 times , with 4 wings it hits 15 times , with 6 wings it hits 21 times and with 8 wings it hits 27 times . Another attack Vercingetorix uses is Wicked Whirl . Vercingetorix continually casts Impenetrable Aura becoming immune to damage and recovering health . The amount of HP it recovers is [ ( Max HP - Remaining HP ) * 0 . 01 ] x 8 . The recovery removes status ailments and adds Bravery ; with four wings the recovery skill adds Faith ; with six wings it adds Protect ; and with eight wings it also adds Shell . During its HP > 60 % phase it will use Impenetrable Aura as soon as its chain gauge exceeds 200 % . After Vercingetorix ' s HP falls below 90 % , it will start using Putrescence , an attack that removes two buffs from a party member , as well as possibly inflicting Poison . After 30 minutes of battle time Vercingetorix will cast Doom on the party leader . Strategy . Before the battle , the party should be well - developed in the Crystarium ( all of them should have Sentinel and possibly Medic ) , and it is recommended to have the Crystarium maxed out . Equipping damage reducing accessories , such as Imperial Armlets and Royal Armlets , is advised , as are accessories that boost Strength or Magic . The extra ATB slot granted by the tier 3 weapons can be of great help . It is especially advantageous if one or more characters are equipped with accessories that synthesize Physical / Magic Wall , since Vercingetorix generally uses a high number of low - level attacks , and both " walls " negate the first 5 to 30 points of damage for every hit taken . The weapons that enhance both Vanille and Fang ' s debuffing abilities are good as they make debuffs more likely to stick . One should use Fortisol and Aegisol before the battle . A good party is Vanille , Fang and Lightning , since Vanille and Lightning know Poison ( Hope knows Poisonga , but that will be of little use here ) , and having Vanille as leader allows the player to manually cast Poison during the attack phase , and Faithra and Bravera during the buffing phase . Tortoise ( SEN / SEN / SEN ) , Infiltration ( SAB / SAB / SAB ) and Rapid Growth ( SYN / SYN / SYN ) are all useful paradigm s for the battle . The party should start with Infiltration , and either cast Libra , or use a Librascope so the AI will know what to do . The aim is to cast as many status ailments on Vercingetorix as possible , especially Poison , which constantly damages its target ' s HP by draining a constant percentage of the target ' s total health . Because Poison takes off a fixed percentage per time regardless of number of hit points , it is especially advantageous on enemies with high HP , such as Vercingetorix . It is even possible to win the battle with just the help of Poison , shifting to a healing / defensive paradigm as soon as Poison has been inflicted . After Poison sticks the party can shift to an offensive paradigm to build up the chain gauge . The party should shift to a healing paradigm as soon Vercingetorix either casts Impenetrable Aura , or a party member ' s health drops below ~ 10 , 000 . If a party member is KO ' d they can be revived via a Phoenix Down , as this will fully restore the character ' s health , unlike Raise . Once the party is healed they should shift to Rapid Growth and buff before Vercingetorix begins attacking again . Whenever the words " Wicked Whirl " appear the party should shift to Tortoise to mitigate the damage . Players can find it difficult to survive when Vercingetorix has sprouted all of its wings . If this is the case , the player can use Vanille as party leader as she has an Eidolon with an attack requiring the use of just one unit . The party can stomp Vercingetorix down to low health ( at around 5 million HP , or 10 million if the party has an Elixir ) , then poison it , summon Hecatoncheir getting a reasonable Gestalt Bar , then going Gestalt Mode and not doing anything , which makes Hecatoncheir use only Chain Cannons , hoping that Poison will kill Vercingetorix before Vanille runs out of time counters . This is an effective strategy that almost guarantees a five star battle rating and operates on the idea that Poison still affects the target while the player is in Gestalt Mode . Vanille is best equipped with her debuffing weapon ( Belladonna Wand and its upgrade Malboro Wand ) and go for the Gestalt Boost synthesized ability ( Speed Sash , Energy Sash , Champions Badge and Survivalist Catalog ) . If one struggles to get a five star rating it is possible to complete the mission and collect the Gold Watch and complete the mission again with it equipped , adding 10 % to the target time .