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Structure Deck: Gates of the Underworld Preceded by Structure Deck: Lost Sanctuary and followed by Starter Deck: Dawn of the Xyz How To Play This Deck This Deck works by Discarding your Dark World monsters from your hand

This evolution only exists in the manga, and can be considered the manga's counterpart of Chaos Xyz Evolution

Italian Necrovolto Se questa carta viene Evocata Normalmente: mischia nel Deck tutte le carte bandite

When you are performing a Fusion, the fused monster is chosen from this Fusion Deck instead of your normal Deck

As for your second question regarding BGS, I dunno, although Im interested to hear the answer as well

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