Oversoul ( Final Fantasy X - 2 ) Oversoul is a condition in " Final Fantasy X - 2 " where a fiend will spontaneously become stronger and gain more powerful attacks and abilities during battle . Mechanics . An Oversoul occurs after a certain number of the same type of fiend have been killed . When Oversouled , the fiend ' s body absorbs pyreflies acquiring a blue cast and its HP and MP are restored and all status effect s removed . Oversouled monsters have different items to drop and steal , and will yield more gil after battle . A successful steal can be done up to four times , as the items are reset when the monster Oversouls . Also , all abilities cost 0 MP when a fiend is oversouled . Thirty percent of enemies ( 54 out of 185 ) cannot Oversoul . No human - type enemies or the Doomstone , Imp , Larva , Revenant , and Spellspinner - type fiends can do so , but magically linked machina can . The classic monsters , Cactuar and Tonberry can Oversoul , and Oversouled Tonberry ' s HP will jump from 9999 to 39 , 996 . Mega Tonberry only has access to its Cry in the Night special move when in Oversoul , making Oversoul the only way for the Gun Mage to learn this Blue Bullet spell . Shinra keeps track of the ' Oversoul Subjects ' and ' Common Subjects ' the Gullwings encounter , and Oversouls encountered are listed in red in Shinra ' s Bestiary ; his enemy statistics , though , are only for regular enemies . The Garment Grid The End with the ability Finale can be obtained from Shinra after every Oversoulable monster has been encountered in this state . It is unnecessary to defeat Oversouled enemies to add them to Shinra ' s list . When the fiend is oversouled in the bestiary , Shinra jumps up and down . For Common Subjects , Shinra just stands still . Oversoul will always be the first action any monster of that type takes , and it will interrupt the timer of its next action to begin to Oversoul ; however , it is itself an action and not instantaneous , and is possible to defeat enemies before they Oversoul . When an Oversoul encounter is due , and the party escapes from battle , the next encounter with that enemy type will still be an Oversoul . When an Oversoul encounter is due , and two enemies of that Oversoul type are encountered at once , there is no level - based determination of which one will Oversoul ; it appears to be random . For example , in Via Infinito , Yellow ( level 1 ) and Red Elementals ( level 9 ) are encountered together , and the one to gain Oversoul may be either the Yellow or the Red . When such a dual encounter occurs , and the one that did not Oversoul is killed , and the party escapes from battle , the next will still Oversoul . This may or may not increase the count for the " next " Oversoul . Killing an Oversoul enemy itself may or may not count towards the required kills for the " next " Oversoul , and the count it adds may be greater than one . Oversoul Limit . The number of each enemy type killed determines when the next enemy will Oversoul . The numbers shown below are the number of kills required ; the next such enemy faced will be Oversouled . E . g , the 21st Behemoth will Oversoul . Running away does not count toward kills , nor does it reset the counter . The specific species of enemy doesn ' t matter : if one kills 10 Haizhe and 3 Deep Haizhe during a hunt , the next Haizhe - type creature encountered will Oversoul . If one is trying to get an Oversouled Deep Haizhe and the 14th Haizhe killed is a regular Haizhe , one will have to wait to kill 13 more Haizhe - type creatures and hope the 14th will be a Deep Haizhe . That is perhaps why completing Oversoul lists on Via Infinito may be preferable , since the species of the same type rarely coincide on VI floors . Requirements for each enemy type :