Tallanis, The Progenitor

Tallanis, also called The Progenitor, is the Elder God of Magic and creator of Ungard and the surrounding multiverse. He manages all the flow of magic in the world and reigns as the Head of the Elder Gods. He is widely worshiped across Rillion, and often he is considered to be the source of all magic as well as its watchkeeper.

In the Campaign (405 FR)
The Twin Comets very famously receive revelation from Tallanis via Lilith Mage-born, a Paladin in his service. At the execution of Elius Varian in Halitax, Mordryn the Arch-Lich said that "they [the Twin Comets] worship a false god," likely referring to Tallanis.