The Hebrew Holy Month
This is the Hebrew month of cheshvan, in our months it is somewhere around October and November. This month plays a vital role in the series because during this month, and this month only, fallen angels can possess nephilim bodies, so that the fallen angel can physically feel. They can only do this if the Nephilim has sworn an oath of featly. It is said that this is the month Nephilim bodies can be taken over because this is the month were the gateways to possession are wide open. And the reason why the gateways are wide open is because this is a month with no holy holidays. When it is not Cheshvan, bodies can still be possessed for very short amounts of time, but no more than a couple minutes .