Swarm of Bats

Medium swarm of tiny beasts, unaligned

Armor Class 12

Hit Points 22 5d8

Speed Fly: 30ft

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

Challenge 1/4 (50 XP)

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 target 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.