Halo Wars 2 is an RTS type of game based in the Halo– universe.
“Halo Wars 2 Official E3 Trailer – In Halo Wars 2, the Spirit of Fire and her crew, led by Captain Cutter, face a deadly new faction known as The Banished. Their chief, the Brute warlord Atriox, is both a deadly warrior and brilliant military leader in control of a massive army. The key to victory is knowing your enemy, but Atriox is a threat no one is prepared for”
Text source: Youtube video description