Member No.: 253
Joined: 29-October 10
The Shadowrun RPG had toxic earth spirits, which were elementals corrupted by pollution, and the Werewolf: the Apocalypse had several monsters like this, if I remember correctly. I can track down my books and scan the pix if you'd like.
I like these "Top 10 Monster X" lists, and hope you continue do more of them in the future (howzabout a skeletal undead creature one?). I posted a link to this Muck Monster list over at Figure Realm in the hopes that it will inspire some of the members for this month's slime critter contest.