n large animal swarm 

Perception +5; darkvision

Skills Acrobatics +9, Stealth +7

Str -1 Dex +4 Con +1 Int -5 Wis +1 Cha -4

AC  17; Fort +4, Ref +9, Will +4

HP 18; Immunities precision, swarm mind

Speed fly 20 feet

Swarming Stings [>] Each enemy in the swarm's space takes 1d4 piercing damage (DC 16 basic Reflex save). The first time each round a creature fails the save and takes piercing damage, it also suffers the effect of beestings. Whenever the bee swarm uses this ability, the swarm takes 1 damage.

Beestings (poison) The creature must attempt a DC 16 Fortitude save. Those who fail take 1d4 poison damage and are clumsy 1 for 1 minute.

The Fall of Plaguestone, page 11.