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 in order to kill Tiamat and gain honor for his god Surtur. However Tiamat defeated Uldrak and cursed him to polymorph into a spinagon. From then he plotted in order to regain his true form. At one point he discovered to need some blood of Tiamat but until the, was impossible for him obtain a sample.

Personality
After millenia isolated Uldrak had begun to lose his mind, often arguing with himself, even in front of srangers.