From Pathfinder Howl of the Wild, which isn't enabled.

Tardigrade Swarm

CREATURE 12

Tardigrades grow no larger than the width of a hair, but when their riverside environments are exposed to heightened levels of magic, these eight-legged omnivores can grow to tremendous sizes.

Perception +21; tremorsense (imprecise) 30 feet

Skills Athletics +19, Survival +21

Str +2, Dex +4, Con +6, Int -5, Wis +3, Cha +1

Eyespots

A tardigrade swarm can't see anything beyond 30 feet.

AC 28; Fort +26, Ref +21, Will +19

HP 140; Immunities precision, swarm mind; Resistances all damage 5 (except area damage)

Tun Marbles

As the tardigrade swarm is damaged, the bodies of those that enter a tun state make the ground treacherous. When the tardigrade swarm drops below 70 Hit Points, the space they occupy is considered difficult terrain.

Speed 25 feet, climb 25 feet

Stylets

Each enemy in the swarm's space takes 4d8 piercing damage (DC 32 basic Reflex save). Creatures that fail their save become Drained 1 or increase their drained condition by one, to a maximum of drained 4.

Pathfinder Howl of the WildORC