Hydaelyn

You concentrate three large shards of pure aether and direct them to crash down at locations you can see within range. The shards of aether explode in a 20ft. radius explosion, dealing 3d10 force damage to creatures in the area. Affected creatures must make a Dexterity saving throw, taking full damage on a failure or half on a success. If a creature is hit by multiple comets, it makes the saving throw once but takes damage from each explosion's affected area. When you cast this spell using a spell slot of 5th level or higher, an additional comet is created.