Downfall of the Gods by K.J. Parker
Tor.com, March 31, 2016
Publisher's description: If you visit the Temple and ask nicely for forgiveness, you might get it—assuming you aren’t Lord Archias and you haven’t killed the Goddess’s favorite musician, Lysippus. But even goddesses are expected to follow certain rules, and as much as she wants to punish Lord Archias it seems her troublesome, all-powerful father forbids it. So the Goddess will just have to get around that by forgiving Lord Archias if he can manage some simple—or, rather, seemingly impossible—tasks. A Goddess has to do what a goddess has to do.
And in Downfall of the Gods that means everything from soothing supernatural egos to accompanying the argumentative Lord Archias on an epic quest to save his soul…and get her own way. As the Goddess and her mortal charge make their way across the world to the Land of the Dead, a host of divine surprises await them. Could what they find at the end be the downfall of the gods themselves? Only time will tell.