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Monster · SRD 5.2.1

Swarm of Piranhas

Medium swarm, unaligned

Armor Class
13
Hit Points
28 (8d8)
Speed
swim 40 ft., 5 ft.
STR
13 (+1)
DEX
16 (+3)
CON
9 (-1)
INT
1 (-5)
WIS
7 (-2)
CHA
2 (-4)
Senses
darkvision 60 ft., passive perception 8
Challenge
1 (200 XP)

Traits

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 piranha. The swarm can't regain Hit Points or gain Temporary Hit Points.

Water Breathing. The swarm can breathe only underwater.

Actions

Bites. Melee Attack Roll: +5 (with Advantage if the target doesn't have all its Hit Points), reach 5 ft. Hit: 8 (2d4 + 3) Piercing damage, or 5 (1d4 + 3) Piercing damage if the swarm is Bloodied.

Medium swarm, unaligned

Special Abilities

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 piranha. The swarm can't regain Hit Points or gain Temporary Hit Points.

Water Breathing

The swarm can breathe only underwater.

Actions

Bites

Melee Attack Roll: +5 (with Advantage if the target doesn't have all its Hit Points), reach 5 ft. Hit: 8 (2d4 + 3) Piercing damage, or 5 (1d4 + 3) Piercing 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