Long Live the Queen

From the introduction: Welcome to the kingdom of Nova! Long ago, Nova was a vast empire ruled by magic-wielders known as Lumens. The kings and queens of Nova were the most powerful Lumens known, and each of the Duchies was ruled by a skilled Lumen as well! one day, however, this magic backfired, attracting untold arcane disasters. In the end, all but a select few Lumens gave their lives fighting these catastrophes, and the great lines were broken.