Swarm of Venomous Snakes

The swarm can occupy another creature's space and vice versa, and the swarm can move through any opening large enough for a Tiny snake. The swarm can't regain Hit Points or gain Temporary Hit Points.

Melee Weapon Attack: +6 to hit, reach 5 ft.. Hit: 8 (1d8 + 4) piercing damage, or 6 (1d4 + 4) piercing if the swarm is Bloodied