When on Bloodlord Mandokir there's an achievement called "Ohganot So Fast" where you have to kill Bloodlord Mandokir without killing Ohgan. (His raptor pet) During the encounter, Ohgan will walk around and kill the spirits that resurrect you.
The exploit is to have the tank (or dps? tested and worked for me as tank) use Holy Wrath as soon as he calls the raptor, and because the raptor is Undead, it will stun the raptor, and he will just stay on the tank (If the raptor isn't killed then he will stay whole time, exploit also works if the raptor is killed, just holy wrath again to stun ((AS SOON AS THE MESSAGE APPEARS ON SCREEN THAT HE'S REVIVED)) and the raptor will stay on you again.) This allows dps to fully just DPS the boss, and the achievement is a cake walk.
This also makes the boss easier if you're struggling on him