Whirlwind Razor

You extend both hands, creating a 120-foot-long, 5-foot-wide line of wind razors. Invisible micro-blades of wind are propelled outward from this gesture. Creatures in that line must make a Dexterity saving throw. On a failure, they take 8d6 lacerating damage and become surrounded by these micro-blades for 3 rounds, having to repeat the saving throw at the start of each of their turns. On a failure of this new saving throw, they take the damage again.

At Higher Levels. When you cast this spell by spending Mana points equal to an 8th-level spell or higher, the lacerating damage increases by 2d6 for each spell level above 7th.