Pale Peak Burning by Paula Harrison 

With the Shadow Faerie still at large and the tribal elders unable to work together to defeat him, Laney and her friends must find the third myrical before it's too late. But with her new powers and old secrets, Laney still has a lot to learn if she's finally going to live up to the red moon's prophesy... The third and final chapter of this enchanting and mysterious faerie adventure series from Paula Harrison.

Also in the series:Red Moon Rising Dark Tree Shining