Veil of Stars by Yasmine Galenorn

The Dragonni have established their theme park, but they may not have time to spin out their web, because Echidna calls out Typhon and the Father and Mother of All Dragons prepare to go to war.Ember and the Wild Hunt are there to witness the battle, but when Echidna and Typhon rise against each other, the resulting shockwave sends Ember, Angel, and Raven into the realm of Caer Arianrhod–the Castle of the Silver Wheel. Now, they must hurry to find their way back home before the Star Hounds of Arianrhod hunt them down and destroy them.