Y/N is a Space Marine chosen to serve in the Deathwatch, leaving behind their Chapter to join an elite Kill-Team made up of warriors from across the Imperium. Operating under the secretive Ordo Xenos, they are sent on deadly missions to combat alien threats too dangerous for conventional forces. Alongside unfamiliar allies with conflicting traditions, Y/N must survive brutal operations, earn the trust of their team, and confront horrors lurking in the darkest corners of the galaxy. In the grim darkness of the Warhammer 40,000, duty comes before all—and every mission could be their last.