Swarm of Poisonous Snakes

Medium beast (swarm), unaligned

Armor Class: 14
Hit Points: 36 (8d8)
Speed: 30 ft., swim 30 ft.

STR: 8 (−1)
DEX: 18 (+4)
CON: 11 (+0)
INT: 1 (−5)
WIS: 10 (+0)
CHA: 3 (−4)

Damage Resistances: bludgeoning, piercing, slashing
Condition Immunities: charmed, frightened, grappled, paralyzed, petrified, prone, restrained, stunned
Senses: blindsight 10 ft., passive Perception 10
Languages: —
Challenge: 2 (450 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 snake. The swarm can't regain hit points or gain temporary hit points.

Actions

Bites. Melee Weapon Attack: +6 to hit, reach 0 ft., one creature in the swarm's space. Hit: 7 (2d6) piercing damage, or 3 (1d6) piercing damage if the swarm has half of its hit points or fewer. The target must make a DC 10 Constitution saving throw, taking 14 (4d6) poison damage on a failed save, or half as much damage on a successful one.

How many for your party

Copies of the swarm of poisonous snakes (450 XP each) against a party of four characters of the same level. Build mixed fights in the encounter builder.

Number of Swarm of Poisonous Snakes for each difficulty, party of four
Party level	Easy	Medium	Hard	Deadly
Level 2	—	1	—	2–20
Level 3	1	—	2	3–20
Level 4	—	2	—	3–20
Level 5	2	3	4	5–20
Level 6	2	3	4–6	7–20
Level 7	3	4	5–6	7–20

In these lists

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Questions

What CR is the Swarm of Poisonous Snakes?

The Swarm of Poisonous Snakes is challenge 2, worth 450 XP, with a proficiency bonus of +2.

How many hit points does the Swarm of Poisonous Snakes have?

36 hit points (8d8), with AC 14.

How many should I use against four 2nd-level characters?

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