Symbiotic Jelly (Infection, Ooze) CR 4
The symbiotic jelly is a small, sickly yellow blob of slimy ooze about 3 inches in diameter. It is found in subterranean realms, caverns and damp, dark caves. The symbiotic jelly possesses several mental abilities that it uses to assail its foes.
When a living creature moves within 30 feet, the jelly attempts to charm it (as if by the charm monster spell, caster level 6th). The victim must succeed on a DC 16 Will save to resist the effects. If successful, the victim feels a tingling sensation but nothing more – the jelly cannot attempt its charm ability more than once per day on the same target. Failing the save causes the creature to fall under the symbiotic jelly’s sway. A creature can make an attempt to save again the following day, though saving does not rid a creature of the symbiotic jelly.
The symbiotic jelly draws sustenance from its host, using the host’s memories to create elaborate illusions in order to keep itself fed. The jelly telepathically orders the victim to remain in its lair and attack the next living creature that venture into the area. The jelly uses its innate illusion powers to create the appearance of a treasure hoard, as well as making its host appear to be a much weaker monster or an entirely different monster altogether. A creature can see through these illusions with a DC 15 Will save if they are interacted with.
Should the host be slain, the symbiotic jelly attempts to charm the creature that killed its host and use it to replace its former host. The symbiotic jelly, if it can be found, is easily killed by an application of acid, cold or fire.
Type infestation; Save Will DC 16
Onset immediate; Frequency 1/day
Effect see text
Symbiotic Jelly from the Tome of Horrors Complete, Copyright 2011, Necromancer Games, Inc., published and distributed by Frog God Games; Author Scott Greene, based on original material by Roger Musson.