This was my first character (not counting a few early deaths) after a few years of break from ADOM. It seems I indeed forgot quite a few things and one of them got me killed. (Years ago I managed to win with a HE wizard.)
Short story: I was playing a wizard with no Detect Traps skill. I had no wand of trap detection. As you know, there are unavoidable traps around the Mana Temple. I thought I'd be able to cast the "Disarm trap" spell at empty space - that's what I was doing throughout the game, e.g. in the Pyramid and in other Temples. But this did not work - the spell was blocked! (Twice.) And after 3 turns I had 0 PPs anyway due to the "drain of magical reserves". Now, I had blessed scrolls and crystals of power, but decided they were useless in this case, since the disarming spell was getting blocked, so it'd be better to save them for later, when I'd be happily Acid-Balling the chaos scum. So I decided to just stomp my way through the traps. Exchanged my ring of the master cat for ring of ice to protect the equipment. But then along the way I fell into a pit which ate like half of my HPs. "No problem", I thought - "let's just wait a few turns". So I pressed and held the '5' key on the numpad, only to see the death screen of my character after 2 or 3 seconds. Yes, Strength of Atlas ended, and he got crushed...
If that's not a stupid death, I don't know what is
Some of my achievements: I got the weird tome and exchanged it for SoCRs. I got the ring of immunity (a crowning gift.) I killed the greater black unicorn, so I had even more access to corruption-cleansing options. I even got the ring of the master cat. One level above the Banshee I found a ring of djinni summoning - used the wish for "teleport control" since my teleportitis was getting infuriating. (Got a ring of tc.) And, you know, of course on the Banshee level I found a blink dog corpse and got the tc intrinsic. A wasted wish, but I thought drinking a PoCC could also be a waste since exactly the same corruption would be likely to happen again in this case (teleportitis is pretty frequent). Then I couldn't wish for a ring of ice so I went through the ToEF with just two fireproof blankets (first time in my life), killed the main beastie by throwing a PoCC at it. (Found a ring of ice later.) I was only level 30 when I got to the Mana Temple. Found the 7LB a bit earlier.
Such a death is one of those things that are supposed to teach me something, but somehow I'm sure this will happen to me again
A side note: something was up with the RNG; I kept finding Girdles of Strength and amulets of Perseverance. All the time!