Overworld (Dragon Mage Saga Book 1): A fantasy post-apocalyptic story

Read Overworld (Dragon Mage Saga Book 1): A fantasy post-apocalyptic story Storyline:

Overworld
The Dragon Mage Saga, Book 1
 
A magic apocalypse. Refugees from Earth. A new world. Elves, orcs, and dragons!
Portals from Overworld have appeared on Earth, and beings intent on conscripting humanity into the mysterious Trials have invaded.
Earth is doomed. Humanity has been exiled. Can Jamie save mankind?
Jamie Sinclair, a young man with unique gifts, must find a way for his family and friends to survive Earth’s destruction and build a new home in Overworld.
The Trials is not a game. Will Jamie survive its challenges?
Join Jamie as he struggles through the brutal Trials while wrestling with his new magics and Overworld’s game-like dynamics.
A fantasy post-apocalyptic survival story of one man’s journey to save humanity.