The Last Oblation. The Dawn of Wrath Chronicles, #3

She spent two books burning everything the old world built. Now something older than all of it is asking her to speak the truth that ends the cycle. The Hollow Thing is re-sealed. The Luminarch's crimes are on the permanent record. The world Seravyn Damien spent two books dismantling is finally, cautiously, starting to grow something new in the ruins. She should be finished. She is not finished. Something older than the gods is coming through a threshold in the eastern Marches.
Not to destroy. Not to conquer. To complete something it has been building across eleven ages of civilization, one ending at a time - and it needs the last Witness to speak the truth of it into the permanent record before it can be done. It also needs Caldren. Specifically, it needs the thing he has been since before the Gods War. The thing that made him dangerous enough to seal. The thing he chose to give up at the end of Book Two - and that the Architect has been waiting three thousand years for him to give up freely.
He knew. He has known since the Architect's first signal crossed into the mortal world. He carried it alone for two months, which Seravyn finds out, which goes exactly as well as you would expect. Seravyn Damien is the last Witness of the eleventh age. Her testimony is permanent. Cannot be burned. Cannot be rewritten. Cannot be sealed. She is the only voice in the history of eleven civilizations who can speak the full truth of what the Architect collected, what it built, what it cost, and whether it was worth the cost - in a record that will exist longer than the divine law that created it.
She just has to survive long enough to say it. And the coalition she built - a former mercenary with a secret in his blood oath, an archivist whose own divine lineage is waking up without her permission, a god of Endings who has spent three thousand years deciding exactly what this age deserves to keep, and a three-thousand-year-old former god of destruction who has opinions about everything and is now also trying to learn the mortal names for plants - is going to have to hold together long enough for her to do it.
One last time. The real last time. The final book in The Dawn of Wrath Chronicles trilogy.