Wildfire (Mystical Elements Book 2) by Meg Lynn

The Dansley siblings moved to Rifton, Oregon for a fresh start. Instead, they discovered why their mother ran from her hometown. The two sisters found the other members of their Elemental generation, but they were all deceived. Now, the Elementals have to face the ancient evil they accidentally brought into their world and the monsters that came with it. New challenges and surprising allies are thrown their way, and the girls struggle to prove themselves worthy of the fabled talismans they hold. Whitney learns the hard way that keeping a distance from the one she loves doesn’t always protect them. She clings on to her escape like a safety net, but will being with her only cause him more pain? Rayn wonders if she’ll ever escape her demons and trust anyone again. After an attack by a new threat, Rayn received mercy from somewhere she least expected. How can she protect her heart when it keeps pulling her towards the danger she intended to steer clear of? The siblings and their friends race against the clock to close the portal to the Shadow Realm and defeat Erebus before he gains his strength. They must stop this war before it truly begins, but what if they're too late?