Lighting the Darkness by Eden Winters

Only Light can balance Darkness.

Lio wakes in someone else’s battered body with plenty of questions but no answers. Who is he? Who are the strangers who rescued him? Why do they call him Tenebris and Darkness? And why does everyone treat him like a feral dog about to attack?
Bel Am’I’s home world of Domus died moments after his escape, trapping him in the human realm with a clear mission. As Light, he must prevent Darkness from destroying Terra and the Domusians who’ve escaped there. Failure will doom billions to certain death, but how can he locate and balance a single, hidden being who doesn’t want to be found?
A mysterious carnival unites Lio and Bel, who must work together to uncover Lio’s true identity and stop him from accidentally annihilating the world. Yet someone doesn’t want them to succeed, someone who will stop at nothing to achieve the total destruction of both realms—even pitting Light against Darkness.

The battle for the end begins…