In Essence, the C’tan were celestial beings that lacked a true form and fed on stars. Until the fateful day, they discovered a C’tan munching on their Sun. However, this plan backfired, and the Necrons started losing the war and ended up nearing total collapse. This all started when the Necrontyr first waged war against the Old Ones in a desperate attempt to hold the empire together. To elaborate, the war in heaven was the first galaxy-spanning war in history, which was between the Old Ones and the Necrontyr. The Necrons are one of the oldest races in the entire setting, having participated in the war in heaven.
