Hephaestus

Hephaestus is a god of blacksmithing and the forge often worshiped by dwarves.

At one point in time Hephaestus was contacted by Tiamat under the pretense of friendship and they bonded over both being viewed as monstrous by the world around them. This friendship turned into a romance and Tiamat urged the god to find a way to free her from her prison in layer of hell: Avernus. Hephaestus succeed in making a key of sort in making the Mask of the Dragon Queen. He soon discovered it was a ruse on Tiamat's part, only using him as a means to escape. Heart broken he divided the mask into five pieces, one for each color of chromatic dragon and spread them across the Sword Coast in hiding places so that Tiamat would forever be trapped.

Additionally, he imposed a form of self exile, stepping back from his duties as a god from his followers and contacting them less and less as the years went by. He retreated back into his workshop of a domain, said the be the greatest forge ever constructed. Only recently has he contacted a young dwarven cleric in the hopes that she might be able to collect the masks and bring them back to him, as he has seen the Dragon Cult's interest in his creations grow. In this task he gives no quarter and feels he must accomplish his goals no matter the cost.