Shieldwolf Dawning

For 13-year-old Samarra, life behind the sheltering walls of the planet Gaia is stifling. But when she convinces her brother, Cassian, to run away to another world, everything they know is turned upside-down. Forced to join the Shieldwolves, an order of shamans, brother and sister find themselves in the middle of an escalating war between two magic factions.