MM'14 p.335, MM'25 p.366
Piranha
Tiny beast, unaligned
Armor Class: 13
Hit Points: 1hp 1d4-1
Speed:
, swim: 40 ft
Senses: Darkvision 60 ft., Passive Perception 8
Proficiency Bonus: +2
Blood Frenzy. The Piranha has advantage on melee attack rolls against any creature that doesn't have all its hit points.
Water Breathing. The Piranha can breathe only underwater.
Actions
Bite. Melee Attack Roll: +5 (with Advantage if the target doesn't have all its Hit Points), reach 5 ft. Hit: 1 Piercing damage.
A Piranha is a carnivorous fish with sharp teeth.
Piranha can adapt to any aquatic environment, including cold subterranean lakes. They frequently gather in swarms.
Suggested Environments
Underwater