Necrus

The Necrus was the name given to a group of species that allied itself with the Predecessor Empire. The species were later integrated into the Empire, but seemingly went extinct.

Early History
Prior to allying the Predecessor Empire, the Necrus were no civilisation, but rather a collection of individuals on the planet Worfd. The Necrus were considered undead by those who met them, and they basically felt nothing. They couldn't die, or so it was said.

The Necrus were late to ally the Predecessors, probably due to their lack of conquests. Unlike Silverstar and even Black Dove, the Necrus hadn't build themselves an empire of planets, but rather remained on Worfd. When the Predecessors found them, the Predecessors found them worthy allies, and an alliance was forged between the Necrus leader and with House Salueís, the Noble House which was currently in control of the Empire.

The Necrus helped the Predecessors purge their galaxy, and later joined the Predecessor Empire and gained a seat on the unified council. However, unlike the Black Dove and Silverstar, the Necrus couldn't join the Predecessors on their conquest for the Milky Way Galaxy. According to their leader, a civil war was brewing, one that may very well see the end of the Necrus themselves.

While the Necrus were informed every once in a while of how the war effort was going, they stopped recieving messages when the Predecessors were being pushed back. Only two messages were actually sent to the Necrus, one telling them that they were being pushed back, and the other that the unified council had fallen, although the latter was never responded to, suggesting that the Necrus were already dead.