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Monster · SRD 5.2.1

Swarm of Insects

Medium swarm, unaligned

Armor Class
11
Hit Points
19 (3d8)
Speed
20 ft.
STR
3 (-4)
DEX
13 (+1)
CON
14 (+2)
INT
1 (-5)
WIS
7 (-2)
CHA
1 (-5)
Senses
blindsight 30 ft., passive perception 8
Challenge
1/2 (100 XP)

Traits

Spider Climb. If the swarm has a Climb Speed, the swarm can climb difficult surfaces, including along ceilings, without needing to make an ability check.

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 Attack Roll: +3, reach 5 ft. Hit: 6 (2d4 + 1) Poison damage, or 3 (1d4 + 1) Poison damage if the swarm is Bloodied.

Medium swarm, unaligned

Special Abilities

Spider Climb

If the swarm has a Climb Speed, the swarm can climb difficult surfaces, including along ceilings, without needing to make an ability check.

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 Attack Roll: +3, reach 5 ft. Hit: 6 (2d4 + 1) Poison damage, or 3 (1d4 + 1) Poison damage if the swarm is Bloodied.

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This work includes material from the System Reference Document 5.2.1 (“SRD 5.2.1”) by Wizards of the Coast LLC, available at https://www.dndbeyond.com/srd. The SRD 5.2.1 is licensed under the Creative Commons Attribution 4.0 International License, available at https://creativecommons.org/licenses/by/4.0/legalcode.

Reformatted and reorganized for presentation on PostRoll; text unmodified.

Licensed under Creative Commons Attribution 4.0 International.

srd-5.2.1 · Version 1.0.0 · Updated Jul 9, 2026