Gears 5’s Escape is the newest game mode in the franchise, and it comes with a whole new story. Three new characters are on a suicide mission to help rid Swarm hives from Sera, and though their story doesn’t directly impact the mode, it is an interesting bit of worldbuilding that enriches the Gears universe further.
Lahni, Keegan, and Mac are Hivebusters. As we see in Escape’s gameplay, their mission is to get caught by Snatchers to infiltrate the heart of a hive, plant a venom bomb, then escape as the hive dies. Though there are some in-game details about the Hivebuster, including banter between them while you’re playing through Escape, the best way to learn about their story is through the new Gears of War: Hivebusters comic.