There are three things that abandoned mines are full of: old tools, loot, and monsters. Your party decided to clear out a local one supposedly containing all three. Of course, treasure hunters who went in never came out. You've yet to figure out why. Sure, you've run across old, eaten carcasses and rusting tools but after hours of looking around no loot or monsters. Maybe your luck was changing though, as a corroded cart creaked into view at the edge of the torchlight. Loaded with glittering ore, something had to have pushed it but nothing is near it now. The party fanned out, approaching the abandoned cart and searching for whatever propelled it. Suddenly, the cart rocketed forward of its own volition, growing teeth and eyes as it jumped off the tracks, slammed into the wizard, and started spitting rocks at the rogue! The truth's unfolded, now it's time to roll initiative. The skip mimic was fostered by miners who discovered the mimic polyp abandoned in their mine....

Box of Teeth is a blog dedicated to horror role-playing games. It features essays, monsters, and other bits and baubles to help game masters and players get the most out of rpg experiences.
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