Chronicle of the Unhewn Throne, book 3: The last mortal bond
Brian Staveley2016

The ancient csestriim are back to finish their purge of humanity; armies march against the capital; leaches, solitary beings who draw power from the natural world to fuel their extraordinary abilities, maneuver on all sides to affect the outcome of the war; and capricious gods walk the earth in human guise with agendas of their own.