Pegasus: The Pegasi Flames of Olympus

When four Pegasi crashed landed onto Irena, Cassie, and Marina's Florida stables, their lives changed forever. Irene and her sisters is thrust into the center of a fierce battle between the Roman gods and terrifying race of multiarmed stone warriors called the Nirads. They must join forces with a girl named Emily, two thieves Paelen and Khyree, the goddess Diana, two boys named Joel and Diego, the Pegasi sisters Bella, Elina, Selina, and Pegasi brother Basim to return Pegasus to Olympus and rescue the gods from certain death.
As Emily and the others went to Olympus the three girls, the Olympian boy, and their Pegasi companions disappeared into another planet known as Xanadu.