The Raven Queen

The Raven Queen is the ancient goddess of death. She is so old and mysterious that her true name has long been lost. Her patrons seek her favor to guide them in death and prevent the curse of undeath from falling on them. In this regard, she and the demon lord Orcus are fierce enemies. The Duskmeadow District of Vasselheim is devoted to worshiping her and is also where her temple, Raven's Crest, is located. As an NPC, the Raven Queen is played by Matthew Mercer.

Appearance
The Raven Queen is described as to be a tall and slender, with flowing black hair and pale, porcelain skin.

The Raven Queen appears as a spectre during the revivification spell of Vex'ahlia, summoned by the opening of her late champions casket. She is first thought to be Vesh, but is revealed during Vax'ildans aid as the form of the Raven Queen. He offers his life to her in place of his sisters, the Raven Queen reaches her hand out to Vax, and nods, agreeing to the offer. Vex unknowingly becomes her new champion.

While Vax'ildan and Keyleth have a discussion about the Raven Queen, a raven appears at Keyleths window, caws at the two, then disappears. It is insinuated to be sent by the Goddess

"Best Laid Plans..." (4x12)
The Raven Queen is summoned during Grog s revivification by Vax'ildan. As a second form of aid, Vax pledges to  serve the Raven Queen unconditionally and without conviction. The Raven Queen sends Vax a vision, seemingly agreeing to the offer.

After these events, Vax finds a ravens feather laying on his pillow which he symbolically puts in his hair.

Vax'ildan
Vax'ildan offered his life to the Raven Queen in place of his sister, Vex'ahlia, as an aid in a revivification spell. She appeared before him, and seemingly agreed to these terms. After which his dreams are plagued by visions sent by the Raven Queen, and often sees ravens. The ravens are Insinuated to be sent by the Raven Queen, as a means of watching him.

Trivia

 * Liam and Matt discussed the relationship between the Raven Queen and her Champion, Vax'ildan, on Talks Machina on February 21st. Matt said that Raven Queen and Vax'ildan did not have a typical cleric-deity relationship, but that She had told Vax the road She wanted him to take and is just letting him walk the path. If he strays from that path, She will intervene.