Edge of Oblivion by Joshua A. Johnston

Edge Of Oblivion

With hopes for civilization’s survival dwindling, Commander Jared Carter is sent to pursue an unlikely lead: a collection of ancient alien religious fragments which may – or may not – hold the key to their salvation.
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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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