Vampire Bat SwarmCreature 1
Source Pathfinder Monster Core
Perception +10 (echolocation (precise) 20 feet, low light vision)
Languages none
Skills Acrobatics +7, Athletics +4, Stealth +7
Str +1, Dex +4, Con +1, Int -4, Wis +3, Cha -3
AC 15; Fort +6; Reflex +9; Will +6;
HP 11
Speed 5 feet (fly 30 feet)
Immunities precision, swarm mind
Weaknesses Area Damage 3, Splash Damage 3
Resistances Bludgeoning 6, Piercing 6, Slashing 3
Echolocation (Precise) 20 feet
A bat swarm can use its hearing as a precise sense at the listed range.
Swarm MindThis 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.
Blood Feast
Each enemy in the bat swarm's space takes 1d4 piercing damage (DC 16 reflex save). Creatures that fail this save also take 1 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.
A wide range of bats dwell throughout the world. Most of these nocturnal animals are harmless insectivores, but deadly breeds of vampire bats and oversized bats the size of horses pose much more significant threats to adventurers.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
AnimalAn animal is a creature with a relatively low intelligence. It typically doesn't have an Intelligence attribute modifier over –4, can't speak languages, and can't be trained in Intelligence-based skills.
SwarmA swarm is a mass or cloud of creatures that functions as one monster. Its size entry gives the size of the entire mass, though for most swarms the individual creatures that make up that mass are Tiny. A swarm can occupy the same space as other creatures and must do so in order to use its damaging action. A swarm typically has weakness to effects that deal damage over an area (like area spells and splash weapons). Swarms are immune to the grabbed, prone, and restrained conditions.