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Swarm of Carnivorous Fish

Family: Swarm

Medium swarm of tiny beasts, unaligned

Armor Class 12
Hit Points 36 (8d8)
Speed 0 ft., swim 40 ft.

12 (+1) 14 (+2) 10 (+0) 1 (–5) 7 (–2) 2 (–4)

Damage Resistances bludgeoning, piercing, slashing
Condition Immunities charmed, frightened, grappled, paralyzed, petrified, prone, restrained, stunned
Senses darkvision 60 ft., passive Perception 8
Challenge 1 (200 XP)


  • Blood Frenzy. The swarm has advantage on melee attack rolls against any creature that doesn’t have all its hit points.
  • 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 creature. The swarm can’t regain hit points or gain temporary hit points.
  • Water Breathing. The swarm can breathe only underwater.


  • Bites. Melee Weapon Attack: +4 to hit, reach 0 ft., one creature in the swarm’s space. Hit: 14 (4d6) piercing damage or 7 (2d6) if the swarm has fewer than half its starting hit points.


A carnivorous fish swarm attacks prey as it crosses through the rivers they call home. The swarm’s initial bites draw blood, which send the school into a frenzy that can strip the meat from the bone in a matter of moments. Swarms of piranhas are most commonly encountered.

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