Slime Crabs (Patreon)

By now your party, while a little worried about how they will escape, are starting to get into the swing of this dungeon. Most of what is thrown your way aren't too hard to deal with. 

A skull here, some pools there, a few more snails, but in the end they all fall to your combined might. That is, till you come to a slime covered passage way. As it is different from the rest, you assume you must be getting closer to the centre. 

In this area you see these half crab half slime creatures tending to the slime on the walls. Collecting and depositing large globs of the stuff. They ignore you, seeing more intent on their tasks. 

Until one of your party slips and disturbs several piles... in unison, the crabs turn and attack.