By performing part of an opera, you call forth spectral illusions of mounted knights to trample your foes under the hooves of their glorious steeds. The shadowy knights appear in your square and ride forward in the direction you indicate, dealing 1d6 points of damage per caster level (maximum 20d6) to all creatures in their path. Half of this damage is cold damage, while half results directly from arcane power and is not subject to cold resistance or immunity. The knights cannot pass through force effects or barriers that block incorporeal creatures or undead.
The damage increases to 1d10 points of damage per caster level (maximum 20d10). Any creature that fails its Reflex saving throw is knocked prone, and must succeed at a Fortitude save or be stunned for 1 round.