I was listening to I think it was the legendary items episode, and was inspired to make this trinket.
The trinket is a finger bone, said to have once belonged to Saint [insert name] who followed the deity of [goodness/light]. It is in a small pouch, and hangs about the neck. Detect magic reveals a faint necromantic Aura, while detect good/evil reveals a faint holy aura. It provides a very slight advantage against death to the person who wears it. It acts as a +1 to death saving throws. (for use in Pathfinder/3.5 the character gains 1 additional hp into the negative before dying)
The divine relic has been engraved with Celestial runes.
I like this one a lot. If you leave it without attunement then it could be tossed around the party as needed. As for Pathfinder, I would probably buff it out a little bit more than just the single HP. The idea of find more bones also fascinates me and what it could mean for stronger versions of this!