Idris is a five-planet system whose role in the First Tevarin War would forever change the UEE. The system's only inhabited planet, Locke (Idris IV), was experiencing a population boom before it was captured by the Tevarin in SEY 2542. Two years later, the operation to retake Locke almost failed until a young Captain Ivar Messer took command and led UPE forces to victory. The battle turned the tide of the war and is considered Messer's first step on the path to becoming Imperator.