Sombra is a former alicorn, turned dark by some kind of magic. He is only mentioned offhand by Luna, but apparently he took the ponies of the crystal empire and began a war which Luna and Celestia fought in, after which he was "driven out" of the plane.

It is speculated that he and his crystal ponies survived to inhabit the dark side, and this led to the creation of the Night Shard. However, the timeline does not quite seem to line up for that.

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