Medium Beast, unaligned
Armor Class 13
Hit Points 16 (3d8+3)
Speed fly +30, walk +10, climb +10
Challenge 1/4
Skills perception +0
Damage Resistances bludgeoning, piercing, slashing
Condition Immunities charmed, frightened, grappled, paralyzed, petrified, prone, restrained, stunned
Senses passive Perception 10
Languages —
Blood Sense. Can pinpoint by scent the location of warm-blooded creatures within 20' of it.
Distracting Buzz. A creature that is not deafened and starts its turn in a space occupied by a swarm of biting gnats must make DC 10 Wis save or become distracted by the droning of the gnats' wings. A distracted creature has disadvantage on attack rolls and ability checks that use Int Wis or Cha for 1 min. A creature can re-save at end of each of its turns success ends effect on itself. If a creature's save is successful the creature is immune to the swarm's Distracting Buzz for the next 10 min.
Swarm. Can occupy another creature's space and vice versa and swarm can move through any opening large enough for a Tiny beast. Can't regain hp or gain temp hp.
Bites. Melee Weapon Attack: +5 to hit 0' 1 tgt in the swarm's space. 5 (2d4) piercing damage or 2 (1d4) piercing damage if the swarm has half its hp or fewer. The target must make DC 11 Con save or become blinded for 1 min. The target can re-save at end of each of its turns success ends effect on itself. Alternatively target can use action to clear its eyes of the insects ending effect.
Source: Tome of Beasts 3 · OGL/Open