Borderlands 2 - How to get the effervescent quality Shotgun (Unicornsplosion)

How to get the effervescent quality shotgunm (Unicornsplosion), in to dlc Commander Lilith and the Fight for Sanctuary, in the game Borderlands 2.
Come ottenere lo shotgun effervescente (Unicornsplosion), nel dlc Lilith e la battaglia per Sanctuary del gioco Borderlands 2.

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