A Soul of Tears. The Second Aurora Chronicles, #6

Dor needs to kill Terriwyn, his sister. He doesn't want to do that but will eventually learn that he might have to. The lose of both Brir and her baby have driver Terriwyn to the edge and with her powers, she is a threat to the entire world. With Charisma, Seraphina, Azriel, and of course the Naiad Amphilio, Dor must figure out how to correct the mistakes he's already made and how not to kill Terriwyn.
To do this, Dor discovers that he not only has to travel to The Ash Territories, but will have to interact with the Rakhasa to retrieve the one item that will allow him to contain Terriwyn without resorting to killing her and along the way, he'll learn that being a god is not all it's cracked up to be. Thus continues the saga of the Second Aurora Chronicles and Dor and Terriwyn's nightmare adventures.