Entozooze

Description
Terrifyingly fast and horrible to behold, entozoozes are 20-foot-long, formless tentacles of sweet-smelling sludge. These horrors slide through dungeons, caverns and other underground lairs feeling around for organic material to consume. Their protoplasm exudes a strange magic-dampening quality that disables the magical properties of magic weapons and armor. Dungeon lords find this particularly amusing as adventurers—having had their weapons coated in the pink residue—assume the weapon is worthless and toss them away in frustration. Had they spent the time it takes to remove the residue, they would quickly discover their weapons continue to function.

Appendix
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