The Great Flow (Magi)

All that young magician Seia has ever known is the royal palace of Kou and the slave dungeons of Reim. But times are changing, and a new threat has awoken; one that is closer than it seems.
More dungeons than ever have appeared, and a new magi with them. Trouble is brewing just over the horizon, and Seia sets out to discover the cause.
In doing so, she begins to learn things that could bring this world to an abrupt end.