You create a vertical wall of whirling, razor-sharp blades made of
Magical energy. The wall appears within
range and lasts for the
duration. You can make a straight wall up to 100 feet long, 20 feet high, and 5 feet thick, or a ringed wall up to 60 feet in diameter, 20 feet high, and 5 feet thick. The wall provides
three-quarters cover to
Creatures behind it, and its space is
difficult terrain.
When a creature enters the wall's area for the first time on a
turn or starts its turn there, the creature must make a
Dexterity saving throw. On a failed save, the creature takes 6d10
slashing damage. On a successful save, the creature takes half as much damage.