The Omnipotence Trilogy: The Four Rings:

Freedom was all Cirus ever wanted. As the storm ripped it away he and his friends found themselves shipwrecked on a new land. After an encounter with the locals they are set down a path of uncertainty as this new world holds terror and wonder. Isolation had been all Aoibhe knew, only one friend who stayed beside her throughout the expanse of time. As a shipwrecked man washed ashore her life of isolation is turned upside down as she helps him to find a way back home.