Dancing Fog

You call forth an unearthly fog from the depths of the Shadowfell.

Choose a point within range - you cause a cloud of fog to appear in a 30 ft. sphere centered on the point you choose. You can choose a number of creatures equal to your spellcasting ability modifier to be able to see through this fog. Creatures other than you and the ones you choose within the fog have Disadvantage on attacks rolls and saving throws. Creatures that attempt to see through the fog see the world as Heavily Obscured. 

While you are within the fog, you can use a bonus action on subsequent turns to teleport to an unoccupied space within the fog's area.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, increase the radius of the fog cloud by 5 ft. per level of spell slot above 3rd.