pf2e.fyi
From Pathfinder #158: Sixty Feet Under, which isn't enabled.

Skitterstitch

CREATURE 6
Perception +14; darkvision
Skills Athletics +17
Str +6, Dex +3, Con +5, Int -5, Wis +0, Cha +0

AC 24; Fort +18, Ref +16, Will +9
HP 115; Weaknesses fire 5
Pest Haven

The rotting hides and molding straw stuffing of skitterstitches are ideal nesting grounds for vermin and insect swarms. Any animal swarm sharing a space with a skitterstitch gains fast healing 3.

Additionally, if a creature deals at least 10 piercing or slashing damage to the skitterstitchstitch, the swarm can use its swarming bites Strike (or similar attack) against the attacker as a reaction.

Effect: Pest Haven

Spider Swarm Host

Skitterstitches host a Spider Swarm within themselves, which erupts out when the Skitterstitch is destroyed


Speed 25 feet
Melee Blade Legs +17 (agile, sweep), Damage 2d4+10 slashing
Melee Fangs +17 (forceful, reach 10), Damage 2d8+10 piercing plus Skitterstitch Venom
Flay

The skitterstitch makes a blade Strike against an animal or humanoid. On a success, the skitterstitch slices a long strip of flesh from the target; if the skitterstitch dealt damage, it deals an additional 1d6 persistent bleed damage.

Skitterstitch Venom
Saving Throw DC 23 Fortitude
Maximum Duration 6 rounds
Stage 1 1d10 poison damage, Off-Guard, and Clumsy 1 (1 round)
Stage 2 1d10 poison damage, off-guard, and Clumsy 2 (1 round)
Stitch Skin (manipulate)
Requirements The skitterstitch hasn't used this ability since the last time it successfully used its Flay ability

Effect The skitterstitch sews flayed flesh to its body to seal tears and rents. The skitterstitch regains 8 healing Hit Points.
Pathfinder #158: Sixty Feet UnderOGL