This addon determines who failed at Defile.
EnsidiaFails is not really usable for determining who the hell messed up, because it displays everyone who got damage from defile anytime.
So Defailure determines who "failed" like that:
When a player gets defile, it records the first one that gets damage from Defile (i.e. causes it to grow).
If the first one is the player who got the Debuff, the second one is considered responsible (the player that got the defile has one "free pass").
It displays the fail during combat and a statistic at the end of the fight.