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Deep beneath Hyrule, sealed off for centuries, is a cavernous expanse lit only by the festering, glowing remains of a demon known as Malladus, carried across the sea and sealed. The network of tracks and their bright lights that once crossed and dotted the prosperous landscape have long since fallen into disrepair and decay.
It would be folly to say that the technological advances buried here were buried forever. Where wheels and steam ruled the caverns, now blue light and stalkers guard the land above. Every discovery builds on the last, but perhaps something was lost in the shift from deep earth to sky.