The demonic hordes are set to arrive on May 15, and you will be ready. You've answered the heroes' call, joined forces with fellow players on the Darkness Falls, Heroes Rise promotional site -- and thanks to your valiant efforts, the first content unlock has been reached.

Check out the first video installment of Developer Diaries below, featuring some of the Diablo III crew discussing different aspects of the game's development.

But hold fast! The battle's only begun. Continue the fight for Sanctuary by creating personal banners, liking your favorite Mark of Valor images, submitting original pieces to the Portrait of a Champion Art Contest, and sharing your journeys on Facebook. Your deeds will be rewarded with additional unlocked content including exclusive interviews, lore excerpts, artwork, and much, much more [cue sinister laugh].