Old School Monsters: Rust Monster

Here's another Will McLean cartoon from the Dungeon Masters Guide. This time, we have a couple of adventurers encountering a Rust Monster, one of Gary Gygax's unique monster creations. Here's what Gary had to say about the origins of the Rust Monster, from Dragon Magazine, Issue #88 (1984):

"When I picked up a bag of plastic monsters made in Hong Kong at the local dime store to add to the sand table array ... there was the figurine that looked rather like a lobster with a propeller on its tail ... nothing very fearsome came to mind ... Then inspiration struck me. It was a Rust Monster."

Both the Wizard and the Rust Monster have rather bemused looks on their faces. Of course, if I was a Fighter, fully decked in heavy metal armor, I would be fearful of the touch of the Rust Monster too. While the Rust Monster is not a terribly ferocious beast, one touch of its antennae and my armor crumbles to rust. Along with the Carrion Crawler and the Otyugh, the Rust Monster acts as garbage detail in the dungeon, cleaning up all the metallic discards while the other two monsters deal with the dead creatures and other organic waste.