You come upon a ruined hamlet, villagers all fled or slaughtered

It's the bowl. Someone might find it in any old shop, it is earthenware mixed from the bones of the last shaman of Nilotte. Whosoever eats from the bowl is possessed by the shaman, who seeks vengeance on all other faiths and gods for driving his from the Cube. The eater gains the shaman's consciousness and powers (10th level druid + any spells of any kind in the "Necromantic" family up to 5th Level + see below) then goes about: 1) Slaying the local clergy and destroying the works of their faith, then2) Converting the locals3) slaying any unconvertible locals4) having the converts march to the ruins of the Wrack Citadel deep within the forest and 5) Kill themselves6) Collapsing into dust, leaving only a ruined town and a bowl, which is inevitably picked up by some scavenger and moved to some other town or merchant.Each time the population of a town sacrifices itself, the next possessee to drink or eat from the bowl is 1 druid level higher.