Tomorrow is shaping up to be a banner day for fans of downloadable content for epic games that can easily take over 100 hours even in their original forms. Not only will Mass Effect 3's ending get the "Extended Cut" many fans have been demanding, but Xbox 360 Skyrim players will be able to download the game's first full-fledged downloadable content pack, Dawnguard, starting Tuesday, June 26.

Bethesda promises "10 to 20 hours of new content" in the expansion, which centers on the decision to become a flying, transforming, gargoyle-summoning Vampire Lord, or a member of the Dawnguard that is sworn to hunt those vampires down. Vampire Lords and Werewolves will have access to entirely new perk trees in the expansion, while Dawnguard members will be able to wield crossbows and craft new, more powerful Dragonbone items. Dawnguard players will also be able to explore a new dimension of trapped souls called the "Soul Cairn."

The 1600 Microsoft point ($20) download will be available in English-speaking regions starting tomorrow, but French, Italian, German, and Spanish players will have to wait until mid-July. PS3 and PC players will have to wait as well, thanks to a timed exclusivity deal that ensures Microsoft's system gets the content 30 days before anyone else.