His own team mate does 0 dmg - he is not denying it.
I do 0 dmg. So he has 100%, any melee nor magic dmg won't work on him during PVE - mobs can't do any dmg to him either, not to mention pvp. The only dmg someone may do on him is dhan, pred with invenom which goes through any kind of Damage drop, or avenger with his ulti buff. And the only way now possible to do any kind of dmg - low one of course is to wear dd pen on weapon or dd pen on guarder, that's the only way. Ah and not kind of any bindstone guard can harm him as well.