Chaos Cannon

You build up energy in your palms for a turn, then on your next turn you release the energy in a 120 ft long by 15ft wide beam. The creatures within the area must make a DC 12 Dexterity Saving Throw, if saved the creature takes half damage. Any creature within the area takes 2d8 + 4d10 damage. Choose one of the d8s. The number rolled on that die determines the attack’s damage type, as shown below.

The player must then Save against a DC 17 Constitution saving throw or take two points of exhaustion.

If the player takes damage before this spell finishes you must save against a DC 15 Wisdom Saving Throw or lose the spell.

If you roll the same number on both d8s, the chaotic energy doubles in intensity causing an additional 2d10 damage.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, each target takes 1d10 extra damage of the type rolled for each slot level above 3rd.