Allen flew down from the sky, the black smoke around him dissipating. Yet under the shock of having just seen Allen move a mountain peak, the wizards around him all bowed respectfully and made way.
Tall and thin, Karkaroff truly could not suppress the panic in his heart. Such a huge city was floating in the air, and realizing that Allen might have done it with a single spell... If it fell... He considered his relationship with Allen to be close, so he gave an awkward smile and asked in a low voice, "Headmaster Harris, forgive my presumption. I just witnessed your great feat, and such power is astonishing... What I want to know is... is this Hogwarts Floating City beneath our feet also being held up by magic cast by an individual?"
"It's an ingenious gravity-reversal spell. By changing the direction of gravity, it uses the power of nature to achieve levitation. Otherwise, if it were just roughly counteracting it by brute-forcing things with magic, I don't think anyone in the world could do it to this extent. It's called Proctiv's Move Mountain. It lets you cut off the top of a mountain peak, make it float in the air, and invert it into a floating mass of earth, with a smooth cross-section suitable for construction... Of course, its difficulty increases with the area affected by your spell and the hardness of the target..." As Allen spoke, he noticed Karkaroff's curled goatee quiver, and the low cry that emerged from his usually mellow voice had turned somewhat shrill from excessive terror. Allen could not help smiling as he added, "Although both cities and mountain peaks need to be lifted by a wizard's spell, the subsequent supply of magic is provided by a magical creation known as a mythallar. Don't