>>5400066My only reasoning for have done that is based on the evidence in canon with the Ferrymen and how the previously Psychic Grey Knights were somehow flipped or turned into Nulls, which lead me to believe their polarity was somehow reversed. So that was what I had based it off of.
That and the way the assignment is arranged from positive to negative, and how psykers can be made to lose their powers through prolonged exposure. So if Psykers can be neutralized, it wasn't so strange to imagine more energy could push them int he opposite direction.
But if it isn't polarity reversal that creates Ferryman Null Marines, what is? Did they figure out a way to take pre-existing nulls and make them into Null Grey Knights from the get go?