Level 20 DE barbarian, precrowned with bracers or war and decked out with all sorts of other goodies, died to Shyssiryxius (Blub's mom). I wanted to kill her for all the experience and the ability to take whatever I wanted from the cave. I cast darkness, did two tremendous blows on her bringing her to severely damaged, and she ran. After a while of very carefully chasing her around, I cornered her and cast darkness again. Then I attacked- 310 HPs gone in one round apparently she can fight back in darkness if she's cornered.
It's a shame too, the RNG had been so good to this guy. Adding insult to injury, I noticed after I died that Preserver must have been generated in the water dragon's cave. He would've been unstoppable. =/