Fen Mosquito Swarm

Creature 3

Large
animal
swarm

Perception: +8; darkvision
Skills: Acrobatics +6, Stealth +8; Str +0, Dex +4, Con +3, Int −5, Wis +0, Cha −5

AC: 18; Fort +8, Ref +11, Will +5
HP: 30; Immunities precision, swarm mind; Weaknesses area damage 5, splash damage 5; Resistances bludgeoning 2, piercing 5, slashing 5

Swarm Mind

Speed: 5 feet, fly 25 feet

Pyrexic Malaria (disease) The victim can't reduce its Sickened condition while it's affected by pyrexic malaria

Saving Throw DC 20 Fortitude

Onset 4 days

Stage 1 Sickened 1 (1 day)

Stage 2 Enfeebled 1 and Sickened 1 (1 day)

Stage 3 as stage 2 (1 day)

Stage 4 Unconscious (1 day)

Stage 5 dead

Swarming Bites ◆ Each enemy in the swarm's space takes 1d6 piercing damage (DC 20 basic Reflex save) and is exposed to pyrexic malaria. Creatures that fail the saving throw also take 1d4 bleed.

Source: Pathfinder Monster Core 2

Running this fight? Add the fen mosquito swarm to the initiative tracker: type its name and the AC, hit points and Perception for initiative fill in, and the book button shows this stat block mid-fight.