It’s actually hard to say. The posts stating that the collision of Dark and Light is what turned them may not be 100% true. Part of their lore states that when Mara entered first she gained the power to shape not just the location but the people as well. So we can’t know for certain how much influence the paracausal power had or how much Mara influenced the transformation. We only know it was the power that was used to fuel the change.