Swarm of Bats

Medium Beast, Unaligned

AC: 12

Initiative: +2 (12)

HP: 22 (5d8)

Speed: 0 ft., fly 30 ft.

STR
5 (-3)
DEX
15 (+2)
CON
10 (+0)
INT
2 (-4)
WIS
12 (+1)
CHA
4 (-3)

Resistances: bludgeoning; piercing; slashing

Condition Immunities: charmed; frightened; grappled; paralyzed; petrified; prone; restrained; stunned

Senses: blindsight 60 ft., Passive Perception 11

CR: 1/4 (XP 50; PB +2)

Habitat: Underdark, Mountain, Hill, Urban

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.

Find this creature in the encounter builder

Swarm of Bats

Source: Monster Manual (2014), p. 337 - Licenses and attribution