Armor Class 12
Hit Points 22 (5d8)
Speed fly 30 ft.
Damage Resistances bludgeoning, piercing, slashing
Condition Immunities charmed, frightened, paralyzed, petrified, prone, restrained, stunned, grappled
Senses blindsight 60 ft., passive Perception 11
Languages —
Challenge 1/4
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 book. The swarm can't regain hit points or gain temporary hit points.
Slam. Melee Weapon Attack: +4 to hit, reach 0 ft., one creature in the swarm's space. Hit: 5 (2d4) bludgeoning damage, or 2 (1d4) bludgeoning damage if the swarm has half of its hit points or fewer.
WDH, p. 156