Philter of Undeath

Found in train station of Preacher's Column in bowl near undead vampiric skeleton.

A thick grey liquid that seems to have green electricity crackling through it. When drank the drinker’s heart ceases to beat. Their skin turns an ash grey and a strange green energy flickers in their eyes. They gain 35 temporary HP and have resistance to non magical attacks and Necromancy magics. They also become immune to all healing magic and health potions. This lasts for 24 hours. The effects of the potion are still largely unknown, and having such strong necromancy magic in your system if you die could have serious side effects.

From Thoom:

''So. This is crazy. But. If you were to drink this it would make you a lot more resilient. Like a WHOLE lot. It'll basically make you kinda undead for a little while. Stop your heart, your breathing etcetera, but you'll still be able to run around and do your usual Graver stuff. BUT. While you're under the effects I don't know if healing magic from spells or potions would have any effect on you.... And if you die die with it in your system... Well. Bad things.''