Haha in Atomic IVAN, I found a shotgun -7. It actually healed opponents
Yes, you heard that right, a shotgun.
(I'm actually considering renaming it as a blunderbuss due to the time period IVAN is set in)
Honestly, there are some things in ADOM and Nethack that would be great in Ivan(Sinks, corruption, etc) while it still keeping its original humor. Ivan should be the king of all roguelikes, so how can it be king if some of its subjects have powers it doesn't?
It would still work, it would just be weakened. The degradation of the potion would be equivalent to the time spent on the ground, but as you said, if the floor was metal, the liquid wouldn't dilute. Also, maybe there could be a scroll of blood changing, where you could choose what you bled, or choose not bleed at all, for a limited time. Maybe there could also be trolls, that would bleed(Of course) troll blood, and their arms and legs would constantly regenerate.