We must know the events surrounding Marg's death!  And the only way to do that, $N, is through the witch-magic of trolls.$B$BBring Marg's head to Kin'weelay in Stranglethorn Vale, at the Grom'gol Base Camp.$B$BKin'weelay is the most powerful witchdoctor of the Darkspear trolls.  If anyone can speak to Marg Nighteye's spirit, it is he.