Dark Ixion ( Final Fantasy X ) Dark Ixion is an optional boss in the International , PAL and the " HD Remaster " versions of " Final Fantasy X " . Available after viewing the arrival cutscene of Calm Lands , he is encountered twice , the first time by talking to a Yevon soldier on the northern section of the Thunder Plains , and after that , by finding him after a lightning strike . Battle . In the first battle , Dark Ixion counters every attack , and inflicts Sleep ( by 99 turns ) , Armor Break , and Mental Break . His non - elemental Thundaja spell may be dangerous , dealing damage as well as Delay ( strong ) . In the first battle , Dark Ixion uses Aerospark when his Overdrive is full , which removes several beneficial status effects : Auto - Life , Haste , NulAll , Protect , Reflect , Regen and Shell . During the second battle Dark Ixion can no longer counter , and his attacks now inflict Confuse instead of Sleep in addition to Armor Break and Mental Break as before . He uses his normal Overdrive , but Thor ' s Hammer is quite weak — 17 , 100 to 19 , 308 damage — but inflicts Full Break and its damage cannot be reduced by anything but another aeon ' s Shield . Evade & Counter allows one to evade his physical attack . Out of all the Original Creations , Dark Aeons and Penance combined , the only evadable attacks are Dark Ixion ' s physical attacks . Dark Ixion is the most accurate enemy in the game , making a combined total of 290 Evasion + Luck required to ensure dodging any evadable attack in the game ; it does not matter whether this is 255 Evasion and 35 Luck , or 35 Evasion and 255 Luck , or anywhere in - between . Dark Ixion is unique in that the party can escape from the battle with Flee . This can be done in both encounters . Strategy . As in the other Dark Aeon battles , it is best to use Auto - Life or call an aeon when the enemy ' s Overdrive gauge is full , although the Full Break effect from Ixion ' s Overdrive can be cured with Dispel . He is especially weak to Armor Break . Dark Ixion has low HP , so he can be defeated quickly by using the strongest Overdrives several times . The party should have extremely high Agility and Luck . Very high Strength , Defense , and Magic Defense are also useful . If the player has a relatively weak party that would die after one hit of any of Dark Ixion ' s moves , two characters can be equipped with Auto - Phoenix . If the player brings out an aeon when Dark Ixion ' s Overdrive gauge is full in the second battle , they will be fine as Dark Ixion has no other attack that attacks more than one opponent . Dark Ixion can be taken down by simply using strong physical attacks , although Dark Ixion will counter . The second battle is easier as Ixion will no longer counterattack , and most of the original strategy applies , but his Thor ' s Hammer can slay the party . Both times it appears it can be killed instantly by Yojimbo ' s Zanmato , as with any other enemy . AP farming . Dark Ixion can be used to farm AP quickly by using a similar method for AP farming Don Tonberry . The player should set up the party with Overdrive → AP , and if possible Triple AP and Triple Overdrive , and have all characters with the Overdrive mode Comrade . It is recommended that this be done in the first battle , as Dark Ixion has no attacks that damage the entire party at once . During battle the party should have First Strike on a weapon and Auto - Phoenix on an armor . When attacked , Dark Ixion will counter for heavy damage . Thundaja will likely deal 99999 damage , assuming the party has been inflicted with Mental Break . After several turns the player should flee . If the player has already defeated the first form of Dark Ixion , this trick can be modified for the second form by fleeing when Dark Ixion ' s Overdrive gauge is full ; however , this is less efficient .