I think I may know what Habit is. In necromantic records, there was a creature called Pyraetheon. It had the power to control high aura. I think that the rake is a varrigil warrior, and the slenderman a Durnammaz. The way to stop HABIT possessing someone, or to kill the rake or slenderman would be to use high aura condensations, like the Thaumatic weapons Nitor and Alumentuam