Arcane magic

As the four women blink to clear their eyes, they see you, a man in grey robes standing atop the table. You quickly speak a word and point, one finger at each of them. At the tips of your fingers, shadowy black mists coalesce into four bands which leap out to latch themselves around the necks of the women. They stand stunned for a moment, then leap at you, shouting in rage and brandishing weapons left close at hand. You laugh and gesture, a quick, grasping upward motion. As one, the women freeze and begin ****, dropping their weapons to clutch at the bands around their throats. They begin to collapse to the ground as you slowly descend from the table, laughing at their struggles. You gesture again and they gasp in suddenly renewed breath.

You speak to the four women lying at his feet. "I am a grey mage, master of space and matter and arcane energy. This is my home. I have been gone for some time, which is no doubt why you have made use of it. But I have returned, and I will remain in residence now that I have some... suitable entertainment.

"On each of the walls of this chamber you have no doubt found a bedchamber. These will remain your quarters for the present- naturally, in accordance with your silly little 'four corners of the earth' game. So glad you found my symmetrical design to be inspiring. Though I have no idea where you got the quaint sun theme. The tower has other purposes, though.

"Around your necks are collars. They will convey my commands, no matter where you are, and will enact my will upon you when I desire it. They also entwine themselves with anything that passes through them. This is normally harmless- the effect will dissipate after several inches unless I choose- but you should know that it will affect anything, from the physical, like your breath-" You tighten upon their throats again for a moment, in reminder, "-to the mental. Such as your nerve impulses." You gesture again and each woman finds herself climbing to her feet, in spite of her frantic efforts to disobey. "And also, because all you Walkers are magically skilled, anything arcane. So, since you probably understand that all magic exists throughout your body and originates in your head, they will also funnel off all powers you might normally have. You're just four women, in my home, at my mercy. You will call me Master."

You look at the four gasping women, staring back at you in shock and confusion.
"So where to begin?"