The Immortal Abyss by Katherine Briggs
Reviewed

The Immortal Abyss

Nations rise and fall in the aftermath of war over the Eternity Gate. The corrupted desert throne stands empty, and the Immortal Abyss awakens.
The Immortal Abyss expands the world of The Eternity Gate, exploring national conflicts and personal maturity while building pathos to satisfying conclusions.
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Lorehaven epilogue sponsors

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