Scarab of Protection

This beetle-shaped medallion provides three benefits while it is on your person. Defense. You gain a +1 bonus to Armor Class. Preservation. The scarab has 12 charges. If you fail a saving throw against a Necromancy spell or a harmful effect originating from an Undead, you can take a Reaction to expend 1 charge and turn the failed save into a successful one. The scarab crumbles into powder and is destroyed when its last charge is expended. Spell Resistance. You have Advantage on saving throws against spells.

All text above is reproduced verbatim from the D&D 5e 2024 SRD. No AI interpretation.