Umbral Radiance Column

You call upon the paradoxical energies of light and shadows, creating 2 towering column of radiance and darkness at a point you can see within range. The column has a diameter of 5 feet and rises up to 20 feet high. Creatures within the column's area must make a Dexterity saving throw. On a failed save, a creature takes 5d8 radiant or 5d8 necrotic damage, or half as much damage on a successful save. 

While maintaining concentration on this spell, as a bonus action on subsequent turns, you can move the column up to 10 feet in any direction.