Tower of the Forgotten — Mitchell Hogan

This is a stand-alone novella set before the events of Revenant Winds.

Niklaus, master swordsman, has not aged a day since being chosen by his mercurial goddess. A slave to her will, he moves from one cryptic mission to the next in the hope of ascending to become her equal.

But even a man who has lived for centuries can sometimes find himself out of his depth.

When Niklaus is sent to kill a sorcerer of the Tainted Cabal, overconfidence leads to a fatal mistake, and neither experience nor skill with a blade can prevail against the forces unleashed against him.