Errevon's Frigid Embrace

The gelid wrath of Errevon the Rimelord snap freezes a 20ft radius sphere from a point you can see within range. Each creature within the area must make a Constitution saving throw. On a failed save, a creature takes 5d12 cold damage and it is restrained within an icy prison. A creature that fails this saving throw by five or more is also incapacitated. A restrained creature may make a Strength saving throw at the end of each of its turns to attempt to break free.On a successful save, it takes half as much damage and is not restrained. A creature with resistance to cold damage has advantage on the Constitution saving throw. A creature with immunity to cold damage automatically succeeds the Constitution saving throw.

Any water within the area immediately freezes solid, and any creatures submerged in that water are trapped as if they had failed the save by five or more.

At Higher Levels. When you cast this spell using a spell slot of 7th level or higher, the damage increases by 1d12 for each slot level above 6th.