The swarm can occupy another creature’s space and vice versa. The swarm can move through any opening large enough for a Tiny creature. The swarm can’t regain hit points or gain temporary hit points.
Ethereal Sight
The swarm can see 60 feet into the Ethereal Plane when it is on the Material Plane
Actions
Flurry of pecks
Melee Weapon Attack, one target in the swarm’s space
To hit: +4
Damage: 7 (2d6) piercing damage, or 3 (1d6) piercing damage if the swarm has half of its hit points or fewer.