Hydaelyn

You manipulate ice aether to cause a flash freezing storm at a location you can see in a 40ft. radius sphere. All creatures in the area must make a Constitution saving throw, taking 5d6 cold damage and 5d6 force damage and become restrained until the end of their next turn on a failure or take half as much damage and not be restrained on a successful one. A creature may use their action to make a strength saving throw, losing the restrained condition on a success. All surfaces in the affected area become coated in slick ice for 1 minute or until melted. A creature traversing the slick ice at more than half speed is required to make a DC 15 Acrobatic check at the start of the movement. Failure causes the creature to fall prone at the start of the movement. When you cast this spell using a spell slot of 8th level or higher, the force damage increases by 2d6 for each slot level above 7th.