Blaðamúr
Blaðamúr is a level six evocation spell with a range of ninety feet and a duration of up to ten minutes which requires concentration to maintain.
Bladamur creates a wall of energy which is sharp to touch. While there is not measure for sharpness, the energy from bladamur can score tempered steel. The approximate dimensions of the wall can be manipulated but the maximum volume is around ten thousand cubic feet. That can be used to make a wall one hundred feet long, twenty feet high, and five feet thick or any combination there in.
One researcher who studied the spell dubbed it a tornado of razor blades.