The Twist of Fate bug was a programing error in the Global version of Final Fantasy Brave Exvius involving Xon. It causes the player to earn unintended benefits while using the character's Twist of Fate ability that usually steals positive buffs, like stat buffs and elemental resistances. However, the bug caused it to steal unintended benefits, like damage immunities. This was the case of the Mech of Fury Trial where Xon could steal Elnath's damage immunity buffs. The bug was quickly fixed.