Deeper in the dungeon, rust traps might target your pack instead of your armor or gear, and could possibly be renamed to “water trap”. On deeper levels and particularly in Gehennom, rust traps phase out to be replaced by acid traps. These deal corrosion and acid damage (and quite a bit of it, like having multiple potions of acid dumped on your head).

Getting hit in the head by a gush of water from a rust trap, or being immersed in water, immediately removes any cream pie on your face.

Rename rust traps to “water traps”, and the gush of water hitting you may hit your pack, wetting several items.

When Fire and Frost Brand come into contact with water due to rust traps or dipping them in fountains, print a message about the water instantly evaporating or freezing. If either is dipped into a fountain, it dries it up.

Fire/water elementals are not only uninjured by fire/rust traps, but are strengthened or healed by them.

Rust traps’ item rusting is delayed. You can use a towel to prevent a wetted item from rusting.