Destructive Wave

The caster channels all of their energy into a massively powerful beam of energy that causes an extreme amount of damage. The beam travels in a line that is 10 ft. wide and 200 ft. long. Any creature with fewer than 5 hit dice that is targeted by this spell dies instantly unless the caster wishes otherwise. The beam of energy deals 20d6 force damage on a failed save, and half as much on a successful one. All concentration checks made while charging this spell are made with a -5 modifier.

Monks of eighteenth level or higher may spend 10 months of study to learn this spell, spending 10 Ki points to cast it.