Monstrous Mondays: Star Jellies for OSR games

"Seek a fallen star," said the hermit, "and thou shalt only light on some foul jelly, which, in shooting through the horizon, has assumed for a moment an appearance of splendour."

- Sir Walter Scott, The Talisman (1825)

Star Jelly

Star Jellies, also known as astromyxin or astral jellies, are creatures known to fall to the earth from celestial bodies.  They are often found where a shooting star is thought to have struck the earth.
These are chaotic and evil creatures of alien will.   They will attempt to attach themselves to other life forms and feed on them.

Upon landing they will move, slowly to the nearest warm-blooded creature it can find.  It prefers humans and humanoids.  Once attached the star jelly will excrete a poison that both paralyzes their victim and causes them to have vivid hallucinations or horrible phantasmagorias.  The victim feels they are being attacked by creatures unknown and will attempt to lash out at them.  In truth, the victim is paralyzed and the jelly is attempting to digest the victim from within.

The jelly's only attack is an attempt to latch on to the flesh of a humanoid.  The victim gets a saving throw vs. Paralyzation (to keep from being paralyzed) and a save vs. Poison each round afterward to realize they are hallucinating.   Once attached the jelly will dissolve flesh, causing 2 points of Constitution damage per round.  The only way to remove a jelly is to burn it off or expose it to direct sunlight.  Something about the combination of sunlight and air damages them and they take fire damage per round in the sun.

Constitution loss is permanent unless healing magic is used.

Star Jellies have an intelligence, albeit an alien one.  They are immune to charm, hold, sleep, and other mind-affecting magics.

https://en.wikipedia.org/wiki/Star_jelly

Star Jelly
(Labyrinth Lord)
No. Enc.: 1 (1-2)
Alignment: Chaotic (evil)
Movement: 10' (30')
Armor Class: 8
Hit Dice: 2+2** (11 hp)
Attacks: 1 (special)
Damage: 2 points of Constitution damage
Special: Causes paralysis and hallucinations
Save: Monster 2
Morale: 12
Hoard Class: None
XP: 50

Star Jelly
(Blueholme Journeymanne Rules)
AC: 8
HD: 2d8+2
Move: 40
Attacks: : 1 (2 points of Constitution damage), causes paralysis and hallucinations
Alignment: Chaotic
Treasure: None
XP: 50

Star Jelly
(Old-School Essentials)
AC 8 [11], HD 2+2 (11hp), Att 1 touch (2 pts Con damage), THAC0 19 [+1], MV 30’ (10’), SV D17 W18 P17 B18 S17 (2), ML 12, AL Chaotic, XP 55, NA 1 (1), TT None
▶ Poison skin: Causes paralysis and hallucinations.

Star Jelly 
(WhiteStar)
ARMOR CLASS: 8 [11]
HIT DICE: 2
HDE/XP: 2/50
SAVING THROW: 18
TOTAL HIT BONUS: +1
MOVEMENT: 3
SPECIAL:  Causes paralysis and hallucination
ATTACK: by touch, 2 points Constitution damage
In the depths of space, their natural environment, Star Jellies are immune to the effects of sunlight.  They can also grow to very large size (up to 10hd) if given enough living organic matter to eat.