Nuitari

Nuitari also known as Master of the Dark Moon and Black Wizard, is the god of dark magic.
He is the son of Takhisis and Sargonnas, and the twin brother of Zeboim. Nuitari, along with Solinari and Lunitari, are more loyal to magic than to the other Gods of their alignment. He is the God of black magic and thus worshipped by black-robed magic users.
Nuitari appears in the sky as a black moon, visible only to black-robed magic users, or other supernatural beings such as Lord Soth, a death knight. When the people of Krynn abandoned the gods after the Cataclysm, Nuitari (along with the other two Gods of magic) were still accepted. High Sanction is reached by the moon Nuitari every 8 days; during this period black robed mages experience increased power due to Nuitari's increased influence on the world.