Mordoc SeLanmere

Mordoc SeLanmere, also known as the Pale Knight or the White Prince, was the self-proclaimed first and utmost powerful vampire king in all of Toril. Mordoc was the disciple of Eldrith the Betrayer, he, however, was not a loyal servant to her. He did provide to her slaves and members for her army.

Battle of Bones and Keep of Pale Night
Mordoc, after becoming the king of the Vampire's, led his army of Vampire's, Nightwalkers and Nightshades into the Battle of Bones where they began to thrive. Just outside, or at the edge, of the Battle, Mordoc built the Keep of Pale Night where his Vampire Servants lived with him.

Dark Alliance
Mordoc's Nightstalkers and Nightshades surrond Vahn, Kromlech and Adrianna.

Dark Alliance II
After capturing the Onyx Heart, Mordoc moved the Onyx Tower into Baldur's Gate where he was then killed by five adventurers. Mordoc himself was serving an unknown god, but it is known that this god launched an assault on Baldur's Gate, the result of the attack is unknown as well.

A Home
Mordoc SeLanmere was a Vampire King who was the most powerful Vampire in all of Toril. Mordoc and his servants went to the Battle of Bones where they quickly conquered the Battle and created a new Vampire Army in which Nightwalkers, Skeleton Warriors and Zombies served. Mordoc had given a home to the vampires and created the Vampire Castle, the Keep of Pale Night.

Scattering
Upon the death of Mordoc SeLanmere in an attempt to hold the Onyx Tower, the Vampires in the Battle of Bones scattered. It is likely there are multiple factions in the Battle looking to gain control of it and become the next Vampire King. If this is so, then each faction has its own army in which Nightwalkers and other Undead Creatures serve, much like they did under Xanhast, servant of Mordoc SeLanmere