The Queen's Raven

You have proven worthy of the Raven Queen's aid, and you can now call upon a raven familiar to accompany you. The Queen's raven is a fey creature that has keen sight, a darkvision of 120 feet, and is proficient in Dexterity(stealth) checks.

The raven acts independently of you, but it always obeys your commands. In combat, it rolls its own initiative and acts on its own turn. The raven can't attack, but it can take other actions as normal. When the raven uses the help and you score a critical hit, you may choose either yourself or an ally you can see within 30 feet of you. The chosen creature can immediately expend a Hit Die to regain hit points equal to the roll + the creature's Constitution modifier.

When the raven drops to 0 hit points, it returns to the Shadowfell, and you gain advantage on all attack rolls against the killer for the next 24 hours. You can call the raven back to your shoulder whenever you complete a short or long rest, whether it be on the same plane as you, or the Shadowfell. As an action, you can temporarily dismiss the raven to a pocket dimension. As an action while it is temporarily dismissed, you can cause it to reappear in any unoccupied space within 30 feet of you. Whenever the raven drops to 0 hit points or disappears into the pocket dimension, it leaves behind in its space anything it was wearing or carrying.

While the raven is within 100 feet of you, you can communicate with it telepathically. Additionally, as an action, you can see through the raven's eyes and hear what it hears until the start of your next turn. During this time, you are deaf and blind with regard to your own senses.