Bella: SmallPowers Book Three

Bella, asked by the leader of the nameless order of wizards to learn more of worlds thought to be lost, finds out quickly that she might not be able to do anything more than accelerating the demise of a dozen ancient cultures and to hasten the end of their universe. An unusual world rich with magic and magical people of many kinds all makes her task more complex and more difficult than anything she has ever faced before. The decay here is endemic, and might be systemic. Bella hits the wall early and must find some way to engage and start the process of repair before madness and sorrow leads her to an evil end.

Third book of the SmallPowers saga.