Stupid stupid stupid stupid.
Dwarf Paladin, reached level 15. Crowned very early with Trusted One and acid immunity. Pickpocketed Preserver. Got assigned doppleganger lord by Thrundarr. Tried my luck in Dwarven Halls - generated a Doppleganger KING, and only just managed to escape. Decided to go to ToTHK to try for the Lord and get the Platinum Ring. Waldy's shop had a Ring of the Clear Mind, so confusion isn't a problem. Wand of Cold (2 charges) + 2 blessed potions of booze = plenty of charges to cross the lake.
Reach the lake. Equip ring. Zap wand. Step onto ice. DIDN'T DROP ITEMS. Ice breaks. Paladin dies.