The Way of Nacor: Tales of Eden Series

How can four stranded children survive and get back home after finding themselves transported to an alien planet in a distant part of the galaxy? Following a family tragedy, the Seekers children find themselves transported to a strange, alien world named Zantura, where a powerful, evil being named Sarin has either murdered or enslaved nearly everyone. The siblings must face and survive a series of seven deadly trials on the journey to find a long-lost ancient relic, which has the power to save Zantura from Sarin, and to send the children home.