[True_Moose]

Actually, AFAIK oozes aren't immune to slashing weapons. Some are immune to spells, and some to normal and low-enchanted weapons, but I don't believe any are. Clay and magic golems are it in terms of immunities. Oh, on second thought, I think that some may have slashing resistances, but not full-blown immunities.

Hehe, I know what the single creature is. I would not have guessed it in a million years, but now I delight in the glee that is knowledge.