As revealed earlier today at QuakeCon 2012, Dawnguard, the first official game add-on for The Elder Scrolls V: Skyrim, is now available to PC users. The English, French, Italian, German, and Spanish versions can be downloaded from Steam for $19.99.

The Vampire Lord Harkon has returned to power. Using the Elder Scrolls, he seeks to do the unthinkable – to end the sun itself. Will you join the ancient order of the Dawnguard and stop him, or will you yourself become a Vampire Lord? Featuring an all new faction quest-line, new locations, weapons, creatures and more; the ultimate choice will be yours.

For more information on The Elder Scrolls V: Skyrim or Dawnguard, please visit www.elderscrolls.com.