I don't know why some mods cause randomizer to crash when ending a run. You should just consider the crash a win. I think it may have something to do with the episode select screen/episode end cutscenes if the other mods replace/add new episodes.
i meant it works mechanically exactly the same as the poison in dicey dungeons: enemy takes the amount of damage equal to poison stat before they start their turn, then poison goes down by one.