"Saligia" by Leo Annakin Belkin

One of the most powerful summoning creatures. Saligia is all of the seven deadly sins wrapped in one rather appealing package. It may appear as a woman or a man, but does not technically have a gender. Like most of the summoning creatures it can only leave the circles when it is summoned. Not that Saligia minds very much at all. It is the master of its domain and has eyes and ears in every corner of the circle. Necromancers who travel into the domain often try to appease Saligia with sacrifices and then ask for its help and guidance. It likes toying with the likes of anyone that dares contact it, or at least it did until it met a man as bent and hellish as it was. Thomas was a convicted criminal guilty of all seven sins at least seven times over. He was found to be beyond redemption and was executed by being used in a summoning. However they met and made a deal: Saligia would give Thomas eternal life and great power if Thomas would bind his soul to it, allowing Saligia to travel between the plains whenever it pleased. Thomas agreed.