ALDUIN, BANE OF KINGS
http://elderscrolls.wikia.com/wiki/Alduin
BASIC SYNOPSIS
Alduin is the first born Dragon of Akatosk, Tamrielic god of Time. With his respect and power as first creation, he had all the other Dragons enslave the men of Skyrim. As a last resort of the rebelling men, they locked Alduin away in time using the Elder Scroll. Now, he surfaces in the present sandbox of a universe he has to play with. Without the Dovahkiin (Dragonborn) to stop him from engulfing life.
"And the Scrolls have foretold, of black wings in the cold, that when brothers wage war come unfurled! Alduin, bane of Kings, ancient shadow unbound, With a hunger to swallow the world!