The Breaking by Sarah Neville

The fates of those in Chrysanthos lay in the balance when elemental and Elite Guardian Vaylin Carina finds a mysterious stone, its unknown power the cause of much death and destruction. Determined to understand its secrets and unlock its magickal potential to protect her people from its threat, she must travel north to learn about the stone’s origin but discovers far more than she bargained for.

But other threats move silently, waiting to strike the mighty Panthea Central and gain control over the portal nexus. Time runs short as the Elite Guardians must determine how the pieces connect and who is an ally and who is a foe.