Dagoth Malan is a member of the Sixth House faction and, like all Dagoths and members of this faction, is hostile to the Nerevarine. Data for Dagoth Malan exists in the construction set, but he is not present in the game, and as such the image is of what he would have looked like.
He is not located in the game.
Malan would have carried:
Malan would have known the following spells: