Death Link. If its specter rider is reduced to 0 hit points, the gloamwing is destroyed.
Flyby. The gloamwing doesn't provoke an opportunity attack when it flies out of an enemy's reach.
Sunlight Sensitivity. While in sunlight, the gloamwing has disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.
Multiattack. The gloamwing makes two attacks: one with its bite and one with its claws.
Bite. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit:18 (3d8 + 5) piercing damage.
Claws. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit:15 (3d6 + 5) slashing damage.
A gloamwing's head is almost ratlike, with prominent teeth, and its leathery skin is stretched tight over its skull, where its eyes are empty sockets. Its body is mottled with bony plates, and great wings stretch from its shoulders.