Mystic Urn

The Mystic Urn is an artifact in Heretic and Hexen. It looks like a grey urn with a golden ankh on it. Using a Mystic Urn restores the player to full health. Unlike Doom's Soulsphere, it can be carried around until needed, but cannot raise the player's health above 100, which makes it similar to the Berserk pack but without the pack's fist improvement power.

Before I found this wiki, I used to play Hexen and I found out that when you save a Mystic Urn (not using it at all) it can save your life when you get to zero. It is a auto life-up, but of course, it can back-fire and I am not sure if it does the same thing in Heretic.