Bites

_Melee Weapon Attack:_ +6 to hit, reach 0 ft., one creature in the swarm's space. _Hit:_ 10 (4d4) piercing damage, or 5 (2d4) piercing damage if the swarm has half of its HP or fewer. The target must make a DC 14 CON save, taking 18 (4d8) poison damage on a failed save, or half as much damage on a successful one.