Brew of Protection from Undead

Undead Ward. The brown liquid inside this bottle does not have any distinct smell, but it does have a horribly rancid taste to it that lingers in the mouth as long as the potion affects the drinker.   When you drink this potion, you are protected against Undead creatures. 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. These effects last for 10 minutes.