Controlling power of the City of Sigil
The Lady, as she is most commonly called, is a power. She has no house, temple, or palace, nor does she have any worshippers. The leatherheads that do make prayers in her name, regret it. Sometimes, a cutter may see her drifting throughout the streets with her dress barely brushing the ground. Of course, just cause she's visiting the Cage (Sigil) doesn't mean that you can go up and have a casual conversation with her berk! She doesn't talk, and those bashers barmy enough to interfere find themselves hurting with a flash of her gaze. Those who inhabit the Cage view her with fear, for she is the sole protector of Sigil.
The Lady has the power to open and close the doors of Sigil. Within this place of neutrality lies portals leading to locations all over the multiverse; all a berk has got to do is find them. Everyone comes to Sigil at some point during their travels throughout the planes. Though there is one specific group that are not allowed access to the Cage. That group would be the other powers, gods, or deities. The doors are locked to them. Because of this, the powers grow frustrated. They hunger for more, but the Lady denies them this right. This is truly proof of the Lady's power.