The Vessel Was the Throne

At the Seventh Temple of Velmaer, Yvera Thaal has spent seventeen years mistaking the second heartbeat beneath her ribs for trauma. When the Cleansing Hand arrives to hunt the last remnant of a forbidden god, she learns the truth: Iruun-Velkar, the nameless seventh god, has been living inside her since the night she died as a child.

To cast him out may kill them both. To keep him means becoming his vessel, his sanctuary, and finally the throne he was never allowed to claim.

There is a god beneath my skin. He says he is not my enemy. He says if they tear him out, I die with him.