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You have to play on Nightmare Difficulty on any map/level in order to obtain mythical quality weapons and armor. For that, you would have to have bought the complete 4 part Lost Eternia Shards DLC pack on the PC to unlock Nightmare difficulty.

http://dungeondefenders.wikia.com/wiki/Nightmare_(Difficulty)

If not, you can easily buy Mythical quality items from other players who have the DLC from their AFK shops.