Medium Swarm of Tiny Beasts, Unaligned
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 raven. The swarm can’t regain Hit Points or gain Temporary Hit Points.
Actions
Beaks. Melee Attack Roll: +4, reach 5 ft. Hit: 5 (1d6 + 2) Piercing damage, or 2 (1d4) Piercing damage if the swarm is Bloodied.
Cacophony (Recharge 6). Wisdom Saving Throw: DC 10, one creature in the swarm’s space. Failure: The target has the Deafened condition until the start of the swarm’s next turn. While Deafened, the target also has Disadvantage on ability checks and attack rolls.
Found on p.371 of MM2025 (Free Rules)