Stellar Engine

A Stellar Engine is a class of stellar megastructure that uses a star to generate practically inexhaustable energy. This energy can be put to any use.

The invention of the Stellar Engines created a crisis known as The Great Err as rushed to build bigger and more powerful Engines. Eventually this turned into an armed conflict as several of the Engines where weaponised and as the construction of new Engines slowed down due to lack of resources, the waring factions rushed to claim as many Engines as they could for themselves. This, in the end, created a several thousand year dark age that is yet to properly end.

History
The earliest known Engine is that of the star Solis Jorkax.