Garlic Spellybean
Uncommon Wondrous Item
Garlic Flavored Treat. This small bean shaped candy tastes like garlic. It has a strong, pungent and slightly spicy flavor, with a firm and slightly crunchy texture.
You can consume this candy as a bonus action, when you do, you become protected against Undead creatures for the next minute. The protection grants several benefits. Undead creatures have disadvantage on attack rolls against you. You also can’t be Charmed, Frightened, or Possessed by them. If you are already Charmed, Frightened, or possessed by such a creature, you have advantage on any new saving throw against the relevant effect.
Ah so that is why vampires can't handle garlic.