Random Polyps

Parasitic Polyps, and any other weird, disturbing creatures you want to unnerve your players with, don't look like familiar animals and plants. They look more like rat-sized microbes or deep sea invertebrates. You could just make up a shape, but here are some tables if you want to randomize them.

First, roll for the basic form.

Scary Invertebrate Shape

1d6		Body Shape
1		Ball
2		Disk-shaped
3		Tubular
4		Fractal/Branching
5		Lump
6		Strand

Then, roll for distinguishing features.

Scary Invertebrate Features

1d6		Extra Features
1		Barbs
2		Whiplike Tail
3		Tendrils
4		Fans/Fins
5		Leech-like Mouth
6		Suckers

Optionally, roll a third time for anomalous features.

Scary Invertebrate Anomalies

1d6		Anomalies
1		Bony Armor Plates
2		Eyes
3		Ink Jet
4		Foaming
5		Light-Emitting
6		Screaming

You can roll each d6 separately, or roll them together and read them in order. Or, if you want really exotic results:

1. Roll 2d6 and 1d8 simultaneously.
2. If first two dice are both odd: Read all three dice in order as shape, feature, anomaly.
3. Otherwise, read dice as shape and two features.
4. A 7-8 on the d8 means no result. For shape, that means "amorphous and constantly changing shape".
5. If it's difficult to tell which of two dice is first in line, read both dice on both of the relevant tables (so you can get really, REALLY weird creatures.)