Uldrak

Uldrak was a former empyrean in Avernus, first layer of the Nine Hells, in the late 15 century DR.

History
Once Uldrak went to Avernus to kill Tiamat and gain honor for his god Surtur. However, Tiamat defeated Uldrak and cursed him to be polymorphed into a spinagon. From then on, he plotted to regain his true form. At one point he discovered he needed some blood from Tiamat but until the, it was impossible for him obtain a sample.

Personality
After millennia isolated, Uldrak had begun to lose his mind. he often argued with himself, even in front of strangers.