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Jellyfish, Jellyfish Swarm

All but invisible in the water, this foul swarm of fist-sized jellyfish wriggles and writhes, a virtual wall of stinging tentacles.

Jellyfish Swarm CR 6

Source Bestiary 2 pg. 170
XP 2,400
N Diminutive vermin (aquatic, swarm)
Init +1; Senses darkvision 60 ft.; Perception +0

Defense

AC 15, touch 15, flat-footed 14 (+1 Dex, +4 size)
hp 54 (12d8)
Fort +8, Ref +5, Will +4
Immune swarm traits, weapon damage

Offense

Speed swim 20 ft.
Melee swarm (3d6 plus poison)
Space 10 ft., Reach 0 ft.
Special Attacks distraction (DC 16)

Statistics

Str 1, Dex 13, Con 10, Int —, Wis 10, Cha 2
Base Atk +9; CMB —; CMD
Skills Swim +9, Stealth +29; Racial Modifiers Stealth +16

Ecology

Environment any aquatic
Organization solitary or bloom (2–8)
Treasure none

Special Abilities

Poison (Ex) Swarm–injury; save Fort DC 16; frequency 1/round for 6 rounds; effect 1d4 Dex; cure 2 consecutive saves.

Description

Jellyfish often cluster together during springtime or when environmental conditions such as an increase in ocean temperature favor it. When conditions are right, jellyfish shift from being a nuisance to being a menace, if accidentally so, for a jellyfish swarm, unlike more aggressive monstrous kin like the giant jellyfish, comprises not aggressive hunters but rather opportunistic strikers. They do not generally move to attack nearby prey, but their nearly translucent coloration makes it horrifically easy for a creature to swim into a swarm unawares. Once a jellyfish swarm deals damage to a creature, the swarm pursues it for several rounds before giving up the chase. Many aquatic races use jellyfish swarms as defensive guardians, trusting a swarm’s lack of interest in moving to keep it stationary for long periods of time.

Creatures in "Jellyfish" Category

NameCR
Bathysphere1/2
Death’s Head Jellyfish1
Giant Jellyfish7
Jellyfish Swarm6
Sapphire Jellyfish11