Giant Jellyfish

Creature 7

Large
animal
aquatic
mindless

Perception: +12; darkvision
Skills: Acrobatics +15, Athletics +17, Stealth +15; Str +6, Dex +4, Con +6, Int −5, Wis +0, Cha −5

AC: 15; Fort +17, Ref +15, Will +1
HP: 165; Immunities critical hits, precision; Weaknesses piercing 5, slashing 5; Resistances bludgeoning 5, poison 10

Speed: 0 feet, swim 20 feet

Melee ◆ tentacle +18 (agile, reach 20 feet), Damage 2d8+8 bludgeoning plus Jellyfish Venom

Jellyfish Venom (poison) Saving Throw DC 25 Fortitude

Maximum Duration 6 rounds

Stage 1 2d8 poison damage and Clumsy 1 (1 round)

Stage 2 3d6 poison damage and Clumsy 2 (1 round)

Stage 3 2d10 poison damage and Paralyzed (1 round)

Squeeze A giant jellyfish can fit into tight spaces as if it were a Medium creature. It can move at its full Speed while Squeezing.

Source: Pathfinder Monster Core 2

Running this fight? Add the giant jellyfish to the initiative tracker: type its name and the AC, hit points and Perception for initiative fill in, and the book button shows this stat block mid-fight.