N Large Animal Swarm
Senses Perception +10; echolocation (precise) 20 feet, low-light vision
Skills Acrobatics +7, Athletics +4 (+7 to Climb), Stealth +7
Str +1, Dex +4, Con +1, Int -4, Wis +3, Cha -3
Echolocation A bat swarm can use its hearing as a precise sense at the listed range.
AC 15; Fort +6, Ref +9, Will +6
HP 11; Immunities precision, swarm mind; Weaknesses area damage 3, splash damage 3; Resistances bludgeoning 6, piercing 6, slashing 3
Speed 5 feet, fly 30 feet
Blood Feast Each enemy in the bat swarm's space takes 1d4 piercing damage (DC 16 basic Reflex save). Creatures that fail this save also take 1 persistent bleed damage.
Although the typical vampire bat has a wingspan of 7 inches and doesn't pose a significant threat to larger prey alone (and indeed, these blood-drinkers can feed without their sleeping victims ever noticing), some unusually aggressive species of these bats hunt in deadly swarms. A churning cloud of vampire bats is much more dangerous than the sum of its individual parts and is capable of inflicting an overwhelming number of bleeding wounds in a frighteningly short span of time.