Bioraptor, spawnling swarm

Echolocation. The Bioraptor can't use its blindsight while deafened.

Keen Hearing and Smell. The Bioraptor has advantage on Wisdom (Perception) checks that rely on hearing and Smell.

Light Hypersensitivity. The bioraptor takes 10 radiant damage when it starts its turn in bright light. While in dim or bright light it has disadvantage to ability checks, saves and attack rolls.

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 bioraptor. The swarm can't regain hit points or gain temporary hit points.

Swarm grapple. When the swarm has more than half its hit points and is in another creatures space it can attempt to grapple a medium sized creature or smaller. Once the swarm has the creature grappled they can move up to half of their flying speed with the creature.

Claws. Melee Weapon Attack: +4 to hit, reach 5ft., one target. Hit: 14 (4d6) slashing damage, or 7 (2d6) piercing damage if the swarm has half of its hit points or fewer.