Rust monster

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A rust monster is a aberration that corrodes and eats metal.

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

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

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

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