Swarm of Bats

Hundreds of high-pitched squeaks fill the air as a mass of small, carnivorous bats surges forth, all of them hungry for blood.
The Nature of Swarms The swarms presented here aren't ordinary or benign assemblies of little creatures. They form as a result of some sinister or unwholesome influence. A vampire can summon swarms of bats and rats from the darkest corners of the night, while the very presence of a mummy lord can cause scarab beetles to boil up from the sand-filled depths of its tomb. A hag might have the power to turn swarms of ravens against her enemies, while a yuan-ti abomination might have swarms of poisonous snakes slithering in its wake. Even druids can't charm these swarms, and their aggressiveness is borderline unnatural.

Swarm of Bats

Hundreds of high-pitched squeaks fill the air as a mass of small, carnivorous bats surges forth, all of them hungry for blood.

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Armor Class	12
Hit Points	5d8
Speed	0 ft.	Fly 30ft.
Strength	5 (-3)
Dexterity	15 (+2}
Constitution	10 (+0)
Intelligence	2 (- 4)
Wisdom	12 (+1)
Charisma	4 (-3)
Damage Resistances	Bludgeoning	Piercing	Slashing
Condition Immunities	Charmed	Frightened	Paralyzed
Petrified	Prone	Restrained	Stunned
Senses	Blindsight 60ft.	Passive Perception 11
Languages	---
Challenge	1/4 (50 XP)
Special 1	Echolocation	The swarm can't use its blindsight while deafened
Special 2	Keen Hearing	The swarm has an advantage on Wisdom	(Perception) checks that rely on hearing
Special 3	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
Action	Bites	Melee Weapon Attack	d20+4 to hit
Reach 0 ft., one creature in the swarm's space	Hit: 2d4 piercing damage	or 1d4 piercing damage	if the swarm has half of its hit points or fewer