Killed by a centaur on depth 18 with 11100 gold.
I had a really solid wizard build going, after taking the staff of blinking on level 1, and finding staves of entrancement, lightning, and poison (which I enchanted up to +8 as my primary offense), and +3 rings of wisdom and reaping to keep them all charged. I think I could have won with this character if not for some particularly bad luck with pit traps. While kiting a poisoned monster, I fell down a pit and landed next a lich, and while I was fighting it some dar came from the other direction. I managed to blink free, but wound up falling down another pit while trying to get back to the stairs, and then another while trying to get back from that one, and just never quite managed to stabilize. Poison is very powerful, but it kind of requires the ability to retreat to safety while things die, and being but off from all escape routes eventually wore me down. The third pit landed me at 1/3 health near two centaurs, with nowhere to blink to. As a last-ditch effort I threw an unidentified potion that had a 60% chance of being paralysis at them, but it turned out to be the 40% caustic gas.