From Pathfinder Kingmaker, which isn't enabled.

Chew Spider

CREATURE 2

UNIQUE LARGE ANIMAL SWARM

Variant spider swarm

Few everyday vermin inspire as much dread as the infamous spider.

Perception +6; darkvision; web sense

Skills Acrobatics +8, Athletics +2, Stealth +8

Str -2, Dex +4, Con +0, Int -5, Wis +0, Cha -4

Web Sense

The chew spiders have imprecise Tremorsense to detect the vibrations of creatures touching their web (which stretches through the entire fangberry thicket).

AC 18; Fort +6, Ref +10, Will +4

HP 22; Immunities precision, swarm mind; Weaknesses area damage 5, splash damage 5; Resistances bludgeoning 2, piercing 5, slashing 5

Swarm Mind

This monster doesn't have a single mind (typically because it's a swarm of smaller creatures), and is immune to mental effects that target only a specific number of creatures. It is still subject to mental effects that affect all creatures in an area.

Speed 20 feet, climb 20 feet

Chew Spider Venom (poison)

Saving Throw DC 18 Fortitude

Maximum Duration 6 rounds

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

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

Chewing Bites

Each enemy in the chew spiders' space takes 1d6 bleed damage (DC 16 basic Reflex). A creature that fails its save is exposed to chew spider venom.

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