The Age of Worms
Notoriously unreliable constructs, made of too many pieces of flesh. As they get more frenzied in combat, they might go berserk. They are immune to any spell that allows spell resistance, except cold and fire spells have a slowing effect with no save. Electricity damage breaks the slow and heals them in excess of their normal hit points. Like most golems, they require adamantine weapons to overcome their damage resistance.