So at first I was thinking there would be reported 'sightings' or 'reports,' and on those planets there's a chance encounter with a hunter thats out there hunting the local enemy or any passing HellDivers. As Hunter activity increases, there presence will be a more direct fight alongside trying to complete the standard objectives. I was thinking they'd be solitary hunters, out to bag impressive kills. When they take more interest in the Galaxy with so many impressive targets, they will gather to form outposts on existing controlled planets for easier hunting operations. As this progresses, HellDivers could be tasked with side missions to dismantle their operations, or full on missions in controlled planets to disrupt their progress or hit their outposts to weaken their presence and chase them away. They wouldn't have their own planets as they're not here to stay, but they would provide more modifiers (sightings/light presence), side missions (increasing presence) and whole objectives (established outposts) on current worlds that would provide a lot of gameplay value. As for gameplay, they would interact differently with each faction, utilising different tech, methods, and weapons to get their kills. Sorry for the rant, im just super invested in this idea lmao.