Doel's Lightning Reign

You create an array of electrical energy on a point of your choosing that rains down on creatures in a 30-foot diameter cylinder that is 100 feet high. Creatures in this area must make a Dexterity saving throw, taking 10d6 lightning damage on a failed save, or half as much on a success. When you make weapon attacks against creatures in this area, they are vulnerable to the damage type of your weapon. Creatures take the same damage when they enter the area for the first time on a turn or end their turn there. On each of your turns after you cast this spell, you can use an action to move the beam up to 60 feet in any direction.

Once this spell ends, a massive beam of energy is unleashed in the same area. Creatures then take 4d10 radiant damage. You are immune to the damage of this spell.