The listing, Dungeon Defenders [Steam Key] has ended.
Dungeon Defenders is a Tower Defense Action-RPG where you must save the land of Etheria from an Ancient Evil! Create a hero from one of four distinct classes to fight back wave after wave of enemies by summoning defenses and directly participating in the action-packed combat!
Customize and level your character, forge equipment, gather loot, collect pets and more! Take your hero through multiple difficulty modes and challenge/survival missions to earn more experience & even better treasure. Join your friends with 4-player online and local (splitscreen) co-op to plan your strategies together or compete in PvP Deathmatch.
More info: http://store.steampowered.com/app/65800/
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This game works on mac and linux too!
Good Luck!