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Swarm of Bats

Medium beast (swarm), unaligned

Armor Class: 12
Hit Points: 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)

Damage Resistances: bludgeoning, piercing, slashing
Condition Immunities: charmed, frightened, grappled, paralyzed, petrified, prone, restrained, stunned
Senses: blindsight 60 ft., passive Perception 11
Languages: —
Challenge: 1/4 (50 XP)
Proficiency Bonus: +2

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.

How many for your party

Copies of the swarm of bats (50 XP each) against a party of four characters of the same level. Build mixed fights in the encounter builder.

Number of Swarm of Bats for each difficulty, party of four
Party level	Easy	Medium	Hard	Deadly
Level 1	2	—	3	4–20
Level 2	3	4–5	6	7–20
Level 3	3–5	6–7	8–10	11–20
Level 4	5–7	8–10	11–13	14–20
Level 5	8–13	14	15–20	—
Level 6	10–14	15–17	18–20	—

In these lists

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Questions

What CR is the Swarm of Bats?

The Swarm of Bats is challenge 1/4, worth 50 XP, with a proficiency bonus of +2.

How many hit points does the Swarm of Bats have?

22 hit points (5d8), with AC 12.

How many should I use against four 1st-level characters?

Against four level 1 characters, 3 is hard by the encounter XP budget.