Rust monster

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A rust monster was an aberration that corroded and ate metal.

Physical description
A rust monster was the size of a small pony, with four insectlike legs and a squat, humped body. Its hide was thick and lumpy and was yellowish tan on the belly and rust-red on the back. Its tail ended in what looked like a double ended paddle. Two long antennae come out of its head, one under each eye.

Combat
A rust monster had a weak bite and did not normally attack with it. They attacked anyone who had metal, however, with their antennae. The touch of an antenna could turn even magical metal items into rust.

Ecology
Rust monsters ate the rust of freshly rusted metal objects.

Behavior
A rust monster could smell metal from ninety feet away. They always went for the biggest source of metal first, and preferred ferrous metals over precious ones.