Rust Monster*

The hide of these creatures varies in color from a yellowish tan underside to a rust-red upper back. A rust monster’s prehensile antennae can rust metals on contact. The typical rust monster measures 5 feet long and 3 feet high, weighing 200 pounds.

A rust monster's touch transforms metal objects into rust (or verdigris, or other oxides as appropriate). Non-magical metal attacked by a rust monster, or that touches the monster (such as a sword used to attack it), is instantly ruined. A non-magical metal weapon used to attack the monster does half damage before being destroyed. Magic weapons or armor lose one “plus” each time they make contact with the rust monster; this loss is permanent.

The metal oxides created by this monster are its food; a substantial amount of metal dropped in its path may cause it to cease pursuit of metal-armored characters. Use a morale check to determine this.