Barnacles

If you ever find yourself wandering through the labyrinthine ruins of the Underground, and hear pained, echoing screams for help, remain cautious; it is most likely a barnacle.

Barnacles are grotesque creatures. A cocoon of Jel is wrapped tightly around a still living monster, slowly eroding their body and mind. The unbearable agony of this process is so intense, that most of the time, the monster is unconscious due to this pain, and when they aren't, they can only scream in agony. The stomach and chest region of the monster has been torn wide open, making room for the cluster of tentacles that are expelled from the body to attack prey, and the arms and legs of the monster have been eroded or restrained to prevent any struggling from the host.

Barnacles are normally found wherever a large supply of Jel can be found. They are normally attached to walls or other flat surfaces, to provide a solid anchor for them.