"This bundle unlocks the following items in Diablo III® when you purchase the Blizzard® 30-Year Celebration Collection:

• Terror Unleashed Wings
• The Dark Murglrrr Pet
• Dark Wanderer Portrait
• The Wanderer's Transmog Set

*Requires Diablo III. Diablo III is rated MATURE 17+ by the ESRB."

More details on the official game page of Diablo® III: Blizzard's 30th Anniversary Bundle ...