Ah, these guys. They were a pain to build. See. Normal Chaos Spawn look derpy. So I said to myself, "Greg, you wanted to paint some Primaris marines, and the person you play the most has like, three different armies of them. Why not make your own Chaos Spawn depicting their spirit being ripped out to serve you, rather than your opponent?"
So I did that, and it was a pain. Those ghosts? Would NOT stay together. Like balancing toothpicks on top of each other. And getting convincing-looking points where they could emerge from the Primaris marines? Annoying. So annoying.