Potion of Concealment from Undead

Potion of Concealment from Undead

Best not to think about what's in it; just be thankful the zombies seem to have taken you off the menu. 

You become effectively invisible to any creatures with the 'undead' keyword. As with invisibility spells, any attack or flashy action will dispel this effect. Very intelligent undead, such as liches or vampires, may, at the DM's discretion, make a hard save  (16+) to see through this effect. You should inform your players if this is a possibility.