Collision — Emma L. Adams

When Earth suddenly gains inexplicably high levels of magic, all fingers point at the Alliance. With griffins and unicorns running amok around London and dangerous monsters escaping from the Passages, Ada and Kay are sent to seek out the source of the trouble. On a distant world, where magic-fuelled forces of nature rule over humans, a disaster is sweeping the land. When Kay and Ada travel there with the other Ambassadors, they're thrown into the centre of chaos. Nature is alive, and angry. Worse, the rising magic level sends their own abilities haywire. While Ada barely has a handle on the magic she still fears, Kay becomes more reckless than ever when testing the boundaries of his own abilities. Faced with living magic, their mission turns into a fight for survival -- and the future of the Multiverse. Can mortals overcome the gods? Collision is the third book in the world-hopping urban fantasy Alliance series.