EditStone of Calling Earth Elementals
This is a convex disc of malachite about the size of a large man's hand. If the owner of the disc cuts off a body part, permanently reducing their number of wound points, then they may attract the attention of an earth elemental. If they owner bleeds into the disc, taking a wound, then they may call that elemental to their aid, which will serve until it is destroyed, the summoner is dead, or the wound is healed. Elementals can be banished.