Ok so I'm reading the Phalanx by Ben Counter and I find it to be horrible. In the course of the story it is relieved that the Soul Drinkers are not a successor chapter of the Imperial Fists. Yet the story also stats that the Soulspear cannot be used useless it's by one with the same genetic structure as Dorn. However the Soulspear is wielded by Sarpendon and other Souls Drinkers with no problems, it activating on their touch Furthermore the main villain of the story can't activate a closed warp gate that was sealed by Dorn and must used the blood of an Iron Knight to do so. But this very villain is a Soul Drinker. So if Dorn isn't the Soul Drinkers primarch but all the signs point to him, then who is?