Just call for reinforcements ~~ only good part about this Debuff resistent a**hole is that you don't need to solo it.
Getting MVP is also not that hard in the fight from what i saw the last couple days (autobattle till i died with my dark team (which relies heavily on debuffs that don't stick either way)and called then for reinforcements)
Depending on who joins up, it seems to be possible to get MVP even with 25% damage done.
But hey, sample size are only several raids in less than a week, so whatever ++
edit:
Have to admit, never paid any attention to the skill level number. i don't even know what its supposed to show X_X