Toolkit13

Necklace (+1 to saves when you have 10 hp or fewer): 

Spirit Fetish: This leather bag binds and constrains a spirit of some sort. Choose the type of spirit when you gain the item. The spirit tugs on your soul, giving you a +1 bonus to saves in certain situations.

For example, a spirit of fire gives you a +1 bonus to saves against cold-based attacks. A spirit of battle might help you make saves against effects that stop you fighting and killing, but wouldn’t care about confusion as long as you’re still hitting people.