New Major Faction - Auriga

It could be called an Alliance or Federetion of Auriga wich includes some of the major races from endless legends , like lets says for backstory after Auriga faced yet another cataclysmic event the Vaulters finnaly built their spaceships and offered any other major races to join them and flee the planet were they later created a new faction on a distant world and this time they learned from past mistakes and realise only true galactic unity can stop another disaster like last time 

Pretty much just an idea from top of my head nothing major you can add something else that would be interesting and unique to the faction