... is when there are either large numbers of monsters in narrow places, or any monsters with ranged weapons. Weaving through the dwarf bone chambers while not fighting any skeletons at all was a little tricky. But in the underwater city, by running through I can get JUST far enough to REACH the shiny magical weapon, but then there's a line of archers behind me and I can't possibly get out alive.
and attempting to level enough to be able to turn undead may be harsh. (I tried it once, while investigating the mage's loot hut in Port Kuudad right after a levelup so that I could tweak the points in to be just barely able to cast it. I cast it, but it *didn't work*. No fair.)