Devious Gods by Caroline Peckham

All paths lead to this end.

Callie:
Ruin chases close on our heels and the price we have paid for a chance at our salvation is higher than any of us could have presumed.
I have claimed a love so brutal that I fear losing it might destroy not just me but the world I have fought so desperately to save.
The gods watch us more closely than ever, urging us to fulfil the task our destiny demands. We only have to make it to the end of this road, but I fear what we might find when we reach that final destination.

Montana:
I am no longer the girl born to ruin and ash, but a woman set on a path of salvation with my heart in the clutches of a monster.
Our eyes are finally open to the true enemies of our kind and now that we have managed to unite against all odds, we are determined to see the games of the gods end.
Time is running out and fate calls our name on a tumultuous wind. Let’s pray that we can answer it before damnation claims us all.