From Pathfinder Society Scenario #5-04: Necessary Introductions, which isn't enabled.

Hoarding Bat Swarm

CREATURE 2

Perception +11; echolocation 40 feet

Skills Acrobatics +8, Athletics +5 (+8 to Climb), Stealth +8

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

AC 17; Fort +7, Ref +10, Will +7

HP 21; Immunities swarm mind, precision; Weaknesses area damage 5, splash damage 5; Resistances physical 6 (except piercing)

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.

Snatch Up

Trigger A creature leaves the swarm's space

Effect The creature must attempt a DC 18 Fortitude save to escape the swarm's space or they are picked up and thrown 5 feet, taking 1d6 bludgeoning damage.

Speed 5 feet, fly 30 feet

Echolocation

A bat can use its hearing as a precise sense at the listed range.

Swarming Bites

Each enemy in the swarm's space takes 1d8 piercing damage (DC 18 basic Reflex save).

Pathfinder Society Scenario #5-04: Necessary IntroductionsOGL