Urthemiel or the "Dragon of Beauty" was one of the Old Gods, a draconic creature (dragon) worshipped as the god of beauty by the Tevinter Imperium. Urthemiel was awakened by darkspawn and transformed into an archdemon in 9:30 Dragon, shortly before the events in Dragon Age: Origins, which revolves around the fifth Blight.
Among the ancient Tevinter people, Urthemiel was the fairest and most graceful of the Old Gods. His beauty is now a horrid mockery of the being he once was.
He is the main antagonist of Dragon Age : Origins.
Origins
Urthemiel is first viewed by The Warden in dreams, before actually witnessing the archdemon firsthand at the Dead Trenches, where it commanded the darkspawn horde to move towards the surface.
Urthemiel led the darkspawn horde to attack Denerim, the capital of Ferelden, where it was promptly slain by the last two Grey Wardens remaining in the country. The fifth Blight was the shortest thus far, ending the same year it began.
If Morrigan performs the ceremony before the final battle to prevent a Grey Warden from dying in order to destroy the archdemon, Urthemiel's soul is transferred into the body of Morrigan's unborn child. She claims that the Old God will not be evil, but simply become a child with his soul.
Awakening
Concept art of an archdemon (possibly Urthemiel, being artwork for Origins)
Codex entry
Once the Tevinter god of beauty, in ancient times Urthemiel was worshipped by musicians, artists, and poets. The Feast of Urthemiel was the largest celebration of the year, an event that lasted a full twelve days. Plays and entire symphonies were written in his honor. Now, he is a maddened husk of his former self, filled with nothing but a desire to destroy all life.
See Also
Template:Old Gods