The Gray Host, also called the Verkarth Vampires, are a group of ancient Vampires, Werewolves, and other abominations. In the base game, they can appear as the final wave of enemies at Dark Anchors, where they are led by by King Styriche of Verkarth. Accompanying Syriche is Fangaril, an undead werewolf summoned from deep beneath Cyrodiil, and Zayzahad, a powerful werebat.
They can be once again be encountered in DLC and Chapter content as the main antagonists of the Dark Heart of Skyrim themed content. This new Gray Host resent King Styriche for damning them to Coldharbour, and instead follow Rada al-Saran. Members can be found within during Harrowstorm activities, where their souls are being pulled from Coldharbour and freed back into Nirn. They are allied with the Icereach Coven and the Draugrkin.
There is one achievement associated with these creatures: