ToME: the Tales of Maj'Eyal

I ran across a rather unkillable yellow ooze. I quickly made it an undead husk. Oh the joys of friendship! It was invincible. I saw its hp go to -thousands. It would face off any foe, any boss, while I retreated and spammed chill of the tomb. Alas, when my necromancer died, the joke was on me. The y...