The first expansion for Diablo 3, which ushers in an era free of auction houses, is set to launch on March 25, digitally and in store. Today, Blizzard has revealed the contents of the Reaper of Souls expansion, retail-exclusive Collector's Edition box set, featuring a variety of the company's typical special offerings.

Like previous special editions of its games, the collection will include a soundtrack, behind-the-scenes DVD (and Blu-Ray), art book, themed mouse pad and in-game content for its library of software. The in-game content includes a "Spectral Hound minion" and aesthetic artifacts, which allow players to "transmogrify" player gear with a thematic visual flair in Diablo 3; a "treasure goblin pet" which explores World of Warcraft's Azeroth through a series of portals; and special player portraits and decals in StarCraft 2.

Blizzard notes "Reaper of Souls Collector's Edition is available in limited quantities" and only at select retailers.