Auroral Winds

You call the flickering lights and howling winds
of the far north to fill a 30-foot-radius sphere. Creatures in the area have disadvantage on Wisdom (Perception) checks that rely on hearing. Any creature that starts its turn in the area takes 6d6 radiant damage. Any creature that ends its turn in the area must succeed on a Constitution saving throw or have its speed is reduced by 10 feet until the end of their next turn. Creatures that are immune to cold are immune to this reduction in speed.
   At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d6 for each slot level above 4th.When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d6 for each slot level above 4th.