Tiny Undead, Neutral
Armor Class 13
Hit Points 10 (3d4 + 3)
Speed 15 ft., Fly 60 ft.
STR
6 (-2)
DEX
17 (+3)
CON
13 (+1)
INT
11 (+0)
WIS
14 (+2)
CHA
12 (+1)
Skills Insight +4, Perception +4, Stealth +5
Damage Vulnerabilities Radiant
Damage Resistances Cold; Bludgeoning, Piercing, and Slashing from Nonmagical Attacks that aren't Silvered
Damage Immunities Poison
Condition Immunities Charmed, Frightened, Poisoned
Senses Darkvision 120 ft., Passive Perception 11
Languages Common
Challenge 1 (200 XP)
Proficiency Bonus +2
Traits

Piercing Gaze. Magical darkness doesn't impede the Raven's darkvision.
Magic Resistance. The Raven has advantage on saving throws against spells and other magical effects.

 
Actions

Gouge. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 5 (1d4 + 3) piercing damage, and the target must make on a DC 11 Constitution saving throw, taking 10 (3d6) necromancer damage on a failed save, or half as much damage on a successful one.
Invisibility. The Raven magically turns invisible until it attacks or until its concentration ends (as if concentrating on a spell). Any equipment the  Raven wears or carries is invisible with it.

Description

Companions of the Raven queen, these creatures are granted to Her loyal followers as guardians. The shadowfell raven could be available as a familiar option for Warlocks of the raven queen that choose the Pact of the chain feature.

(based upon the Imp, with thematic alterations)

ccbandson