The PVE mode is not bad, VS Tyranids is sometimes fun. However, to give more variety to the game, it would be cool to fight Necrons. Since they move slow most of the time, it's unlikely that they would be good as a player faction. Plus, Necrons are like the Zombies of Warhammer 40k. So in the right setting, it will be creepy as well as fun. Everyone feel free to add or comment on this topic. All your opinions are appreciated. Hopefully, the developers will consider this.