The Hell Wars
These rings are a special creation of a being known only as The Necromancer. Graced with the image of a skull, the rings are used for the express purpose of keeping track of the Necromancer’s many agents. Once given a ring, the agent is no longer allowed to remove it willingly. They are given a warning by the Necromancer when given a ring and if the adventurer ever does remove the ring, he is immediately hunted down. The ring is then sown to the flesh, bone and very life force of the adventurer and the only possible way to remove the ring is by removing the entire hand with it.
The ring is able to detect the life force of the wearer and their intentions. Upon death the ring sends out a signal which will lead a recovery force to the body of the wearer. The bones will be salvaged and and muscle or tissue left will be burnt along with their gear. If the ring detects actions that are directly against the goals of the Necromancer, the death signal is sent out. Every minion sent on a recovery mission is under the express orders to make sure whatever gives off the signal is dead. If it isn’t, they have to make it so.