Potion of Undeadening

I think that there should be a potion that makes Undead mobs neutral towards the you (They don't attack you unless you attack them), but it makes you burn under direct sunlight to balance the effect, and sort of makes you look like a zombie. This potion would work on Villagers so that they aren't attacked by Zombies, and this potion would have a special effect on undead mobs, but I'm not sure what it would be.