Scarab of Protection
Wondrous Item,
Legendary
(requires attunement; cost 80000 gp)
Crafting Components
Gold bar blessed by a celestial associated with a god of life or protection
After being held in your hand for 1 round, this scarab medallion shimmers with magical inscriptions. The scarab has 12 charges, crumbling into dust when it has no charges left.
This item has two benefits while it is on your person. First, you gain advantage on saving throws made against spells. Second, if you fail a saving throw against a necromancy spell or either an attack from or trait of an undead creature, you may instead succeed on the saving throw by using your reaction to expend a charge from the scarab.
Source