The Reactor Core Explosion was a catastrophic event that occurred in Libaterra during the later years of the Great War. Heroes of the Grand Alliance had taken the Cricket Ball of Magic to an ancient reactor core which was located in the underground caverns beneath Lutherin. When the cricket ball was recharged in the reactor, the power that was released caused a giant explosion that devastated Lutherin and nearly the rest of Libaterra.
While the Alliance fled Libaterra in a hurry, a group of mages led by Jemuel appeared and saved the land from total destruction by placing protective wards around the countryside. The damage had already been caused, and it would take years for Libaterra to recover from the catastrophe. Lutherin was renamed Alent, and eventually a new faction named the Magicracy of Alent emerged in the power vacuum of Libaterra.