He pulled out her desk chair and sat while he lectured her on better ways to summon a demon. "By blood is the swiftest way if you’re already known to one of us, and you know our name in turn - a small cut should suffice to empower your call," he told her. "The second method is by formally invoking a demon’s name in a circle of power strengthened by runes. This is the best option for an unfamiliar demon. Call three times while drawing on your magical power, including all the demon’s titles and yours. Remember you must leave a gap in the circle for the demon to exit through at will. And the last and most powerful method is by a death offering – a sacrifice of an animal in a demon’s name."