I don't know, if it is really this Collection.

Includes 25 items: Dungeon Defenders, Dungeon Defenders Halloween Costume Pack, Dungeon Defenders Halloween Mission Pack, Dungeon Defenders: Penny Arcade Character Pack, Dungeon Defenders The Great Turkey Hunt! Mission & Costumes, Dungeon Defenders New Heroes DLC, Dungeon Defenders Warping Core Challenge Mission Pack, Dungeon Defenders - Etherian Holiday Extravaganza, Dungeon Defenders - Quest for the Lost Eternia Shards Part 1, Dungeon Defenders - Quest for the Lost Eternia Shards Part 2, Dungeon Defenders: Quest for the Lost Eternia Shards Part 3, Dungeon Defenders - Quest for the Lost Eternia Shards Part 4, Dungeon Defenders: Assault Mission Pack, Dungeon Defenders: Barbarian Hero DLC, Dungeon Defenders: Etherian Festival of Love, Dungeon Defenders - President's Day Surprise , Dungeon Defenders Lucky Costume Pack, Dungeon Defenders: Series EV Hero DLC, Dungeon Defenders - Karathiki Jungle Mission Pack, Dungeon Defenders: City in the Cliffs Mission Pack, Dungeon Defenders: Summoner Hero DLC, Dungeon Defenders: Talay Mining Complex Mission Pack, Dungeon Defenders: Jester Hero DLC, Dungeon Defenders Anniversary Pack, Dungeon Defenders - The Tinkerer's Lab Mission Pack