Clinging Soul  

if you get tossed down the well while fighting legion your in a long hallway and its filled with these guys, they hardly hit at all but they do stun you or something on hit, hence the name. Behemoth lives down in the well also. Its generally just a nuisance that mythic put in while your fighting legion. Can be pretty bad though if all your best tanks get thrown at once.
-Demi