Swarm of Piranhas

Swarm of Piranhas is a medium unaligned beast.

Beasts are non-Humanoid natural creatures, like horses and wolves, as well as most giant animals.

Movement: walk 5 ft., swim 40 ft. • Senses: darkvision 60 ft.

Signature traits include Swarm, Water Breathing.

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. 8 (2d4 + 3) Piercing damage, or 5 (1d4 + 3) Piercing damage if the swarm is Bloodied.