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Monster · SRD 5.1

Swarm of Rats

Medium swarm of Tiny beasts, unaligned

Armor Class
10
Hit Points
24 (7d8)
Speed
30 ft.
STR
9 (-1)
DEX
11 (+0)
CON
9 (-1)
INT
2 (-4)
WIS
10 (+0)
CHA
3 (-4)
Senses
darkvision 30 ft., passive perception 10
Challenge
1/4 (50 XP)

Traits

Keen Smell. The swarm has advantage on Wisdom (Perception) checks that rely on smell.

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

Actions

Bites. Melee Weapon Attack: +2 to hit, reach 0 ft., one target 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.

Medium swarm of Tiny beasts, unaligned

Special Abilities

Keen Smell

The swarm has advantage on Wisdom (Perception) checks that rely on smell.

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

Actions

Bites

Melee Weapon Attack: +2 to hit, reach 0 ft., one target 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.

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This work includes material taken from the System Reference Document 5.1 (“SRD 5.1”) by Wizards of the Coast LLC and available at https://dnd.wizards.com/resources/systems-reference-document. The SRD 5.1 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-5.1 · Version 1.0.0 · Updated Jul 9, 2026