Elysium by Keith A. Robinson

Elysium

Braedon Lewis is unwittingly pulled through a mysterious portal and transported two hundred years into the future, in an exotic, underground world inhabited by other humans.
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To save their kingdom of doppelgängers, both orphaned Waruu and King Daccias must face their greatest enemy—each other. 

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Sons of Day and Night by Mariposa Aristeo