Swarm of Bats is a Large swarm of tiny beasts with unaligned alignment and Challenge Rating 1/4 in the 2024 SRD. This stat block includes AC 12, 11 hit points, speeds, traits, and actions.
Bites - Melee Attack Roll: +4, reach 5 ft. Hit: 5 (2d4) Piercing damage, or 2 (1d4) Piercing damage if the swarm is Bloodied.