Sources
CR
Type
Size
Alignment
Movement

Gloamwing

Large Undead, Neutral Evil

Armor Class 16 (natural armor)
Hit Points 136 (16d10 + 48)
Speed 30 ft., fly 60 ft.
STR
20
+5
DEX
16
+3
CON
17
+3
INT
2
-4
WIS
11
+0
CHA
6
-2
Saving Throws STR +8, DEX +6
Skills Perception +3, Stealth +6
Damage Resistances necrotic; bludgeoning, piercing, slashing, from nonmagical attacks
Damage Immunities poison
Condition Immunities Charmed, Exhaustion, Frightened, Poisoned
Senses darkvision 120 ft., passive Perception 13
Languages understands Common
Challenge 8 (3,900 XP)

Traits

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.

Actions

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.

Lore

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.