This amulet has 3 charges. While wearing it, and if you are attuned to it, you can use a bonus action to expend 1 of its charges to cast the Protection from Evil and Good spell from it solely for the protection from fiends.

The necklace regains one charge daily at sunset. If you expend the necklace's last charge, roll a d20. On a 1, the necklace crumbles into ashes and is destroyed.