Eclipsebeam

A column of shadow descends in a 15-foot radius, 40-foot high cylinder centered on a point within range.  Until the spell ends, magical darkness fills the cylinder: light spells of lower level cannot penetrate it, and creatures within the area are blinded.

When a creature enters the spell’s area for the first time on a turn or starts its turn there, it is chilled by an unearthly shadow, and it must make a Constitution saving throw. On a failed save, it takes 3d8 cold damage and its speed is halved; on a success, it takes half as much damage and its speed is unaffected.

On each of your turns after you cast this spell, you can use an action to move the beam 30 feet in any direction.

At Higher Levels.  When you cast this spell using a spell slot of 5rd level or higher, the damage increases by 1d8 for each slot level above 4th.