"Storm Slayer" Rust Monster
"You are down a mine, the only light coming from your lantern, in a square, dead-end chamber littered with the rusted remains of mining equipment – everything from pick-axes to gold-panning trays. Squatting at the center of all this rusting machinery is a massive toad-like creature with skin the color and texture of rusting metal. The Rust Monster is chewing pieces of metal between its diamond-hard teeth. It waddles around on claw-like feet and opens its broad mouth, to reveal row upon row of shark-like teeth, as it lurches towards you to attack."