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Swarm of Wasps

Medium beast (swarm), unaligned

Armor Class: 12 (natural armor)
Hit Points: 22 (5d8)
Speed: 5 ft., fly 30 ft.

STR: 3 (−4)
DEX: 13 (+1)
CON: 10 (+0)
INT: 1 (−5)
WIS: 7 (−2)
CHA: 1 (−5)

Damage Resistances: bludgeoning, piercing, slashing
Condition Immunities: charmed, frightened, grappled, paralyzed, petrified, prone, restrained, stunned
Senses: blindsight 10 ft., passive Perception 8
Languages: —
Challenge: 1/2 (100 XP)
Proficiency Bonus: +2

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 insect. The swarm can't regain hit points or gain temporary hit points.

Actions

Bites. Melee Weapon Attack: +3 to hit, reach 0 ft., one target in the swarm's space. Hit: 10 (4d4) piercing damage, or 5 (2d4) piercing damage if the swarm has half of its hit points or fewer.

How many for your party

Copies of the swarm of wasps (100 XP each) against a party of four characters of the same level. Build mixed fights in the encounter builder.

Number of Swarm of Wasps for each difficulty, party of four
Party level	Easy	Medium	Hard	Deadly
Level 1	1	—	2	3–20
Level 2	2	—	3	4–20
Level 3	2	3–4	5–6	7–20
Level 4	3–4	5–6	7	8–20
Level 5	5–7	8–10	11–14	15–20
Level 6	6–9	10–11	12–14	15–20

In these lists

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Questions

What CR is the Swarm of Wasps?

The Swarm of Wasps is challenge 1/2, worth 100 XP, with a proficiency bonus of +2.

How many hit points does the Swarm of Wasps have?

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

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

Against four level 1 characters, 2 is hard by the encounter XP budget.