Boreas's Embrace

You cause a downburst of freezing cold wind and rain with
a 15-foot radius, which freezes in moments into a sheet of
slick, encasing ice. All fires in the area are extinguished.
Creatures in the area must make a Strength saving throw,
taking 6d6 cold damage and being restrained on a failed
save or half as much damage and no additional effects on
a successful one. Anyone entering or moving through the
affected area for 1 minute afterward must succeed on a
Dexterity saving throw or fall prone.

At Higher Levels.When you cast this spell using a
spell slot of 5th level or higher, you may either inflict an
additional 1d6 cold damage or increase the duration of
the ice slick by 1 minute for each slot level above 4th.