Pack Tactics. The [listed creature] has advantage on an attack roll against a creature if at least one of the [listed creature]’s allies is within 5 feet of the creature and the ally isn’t incapacitated

Swarm. The swarm can occupy another creature’s space and vice versa, and the swarm can move through any opening large enough for a [reference creature]. The swarm can’t regain hit points or gain temporary hit points.

Dive. Melee Weapon Attack: +3 to hit, reach 30 ft., 1 target. Hit: 10 (2d6 + 2) [piercing] damage.

Claw. Melee Weapon Attack: +2 to hit, reach 4 ft., 1 target. Hit: 6 (2d4 + 1) [piercing] damage. 

Shadow Bolt. Ranged Weapon Attack: +4 to hit, range #40/80 ft., 1 target. Hit: 16 (5d4 + 4) [piercing] damage.