The Tides of Oslion

The Tides of Oslion is a giant book series which contains a sub-series for each author, making two sub-series', both known as the Legacy Cycle and the Avengement Trilogy. Each sub-series has a max of three books, each in their own region of the world Oslion, Eil'ithral and Bwandar, until the final book.