The Throne of Endings. The Dawn of Wrath Chronicles, #2

The world is not fixed. But it is honest. And that is going to cost them everything. Thirty days ago, Seravyn Damien burned the most powerful document in the world. She didn't know it was keeping something sealed. Now the Underbreach walls are cracking. A god that has been trapped for three thousand years is pushing against every containment boundary the old world built. Not to destroy. To get out before something far worse reaches his territory first.
And that something - the thing the Luminarch spent centuries using as a power source without admitting what it was - is seeping through the cracks she made. Seravyn thought she was done being a weapon. She thought the hardest part was behind her. She was wrong about both. To stop what is coming, she needs three things. The truth about a god who was sealed before the world's recorded history. A blood-soaked document buried in a desert vault that only her bloodline can open.
And the cooperation of the woman who built a kill switch into her soul and called it loyalty. Caldren, the Devourer, is fully embodied for the first time in three centuries. He is adjusting to the physical world with the specific frustration of a god who has opinions about everything and is now able to knock things over. He is also, quietly, trying to figure out what you do with love when the world keeps scheduling catastrophes.
He already knows what is in the desert vault. He has known for weeks. He is trying to decide how to tell her that she is not just a former Godkiller with a strange ability to read dead languages. She is the last of something the Luminarch spent three thousand years trying to end. And the only thing that can lock the door on what they accidentally let loose.