Swarm of Bats

Medium, swarm of Tiny beasts, unaligned

CR 1/4AC 12HP 22 (5d8)

Speed fly 30 ft, walk 0 ft

str: 5; (-3)
dex: 15; (+2)
con: 10; (+0)
int: 2; (-4)
wis: 12; (+1)
cha: 4; (-3)

Damage Resistances bludgeoning, piercing, slashing

Condition Immunities Charmed, Frightened, Grappled, Paralyzed, Petrified, Prone, Restrained, Stunned

Senses blindsight: 60 ft., passive_perception: 11

Traits

Echolocation. The swarm can't use its blindsight while deafened.

Keen Hearing. The swarm has advantage on Wisdom (Perception) checks that rely on hearing.

Swarm. The swarm can occupy another creature's space and vice versa, and the swarm can move through any opening large enough for a Tiny bat. The swarm can't regain hit points or gain temporary hit points.

Actions

Bites. Melee Weapon Attack: +4 to hit, reach 0 ft., one creature in the swarm's space. Hit: 5 (2d4) piercing damage, or 2 (1d4) piercing damage if the swarm has half of its hit points or fewer.