Bethesda Softworks has confirmed the first expansion of their massive role-playing game The Elder Scrolls V: Skyrim will launch tomorrow on Xbox 360.

The download titled Dawnguard releases on Xbox Live on June 26. Bethesda did not provide details on when it will make its PC and PlayStation 3 debuts.

In Dawnguard, players become vampires, fighting to stop the Vampire Lord Harkon from destroying the sun. Our hands-on preview features more details.

The expansion features about 15 hours worth of content, and players can continue to explore as a vampire once Dawnguard is complete.