[@PKMNB0Y]

*I mean he'd still be the weakest since he has to take the damage first to do anything substantial, Even Arash doesn't have to do that and his sole np is a suicidal one*

Ok so a work of what end of four nights does based on the FGO skill additional to murderous intent.

"Grants the ability to shrug off a lethal attack once." (and for flavor reasons add a 4 day cooldown.) 

This fits with Angra Mainyu's kit of taking as much damage as possible like some sort of rampaging masochist, and combos well with Verg Avista, without being overbearing or broken.