Trendy Entertainment are celebrating the one year anniversary of Dungeon Defenders with a DLC anniversary pack (free for two weeks) and a massive 75 percent off its normal price on Steam (lasts another 36 hours).
The anniversary pack includes a new map/mission (Tavern Defenders), and there will party hat accessories, birthday cake crystal core, and a "Kobold on a Treadmill" pet as part of the DLC as well.