Excalibur is a "sword that amplifies", converting its user's magical energy into offensive power and releasing it. It is a weapon of directive energy that converts the magical energy of the wielder into light by accelerating it with her factor of the dragon, intensifying the kinetic energy by convergence and acceleration, allowing for the use of Divine Spirit-level thaumaturgy. It is an "ultimate killing technique" that releases light holding energy equaling to Artoria's total amount of magical energy from the tip of the blade once the sword is swung. To an observer, it looks like a giant beam of light, but the attack's target point is only at the tip. It is the "ultimate slash" that cuts through everything in the "area" the light goes through. Its enormous power heats space around the tip, and as a result, it is interpreted as a wave of light that mows across the surface of the earth. One could also call it a directed energy weapon. Even if it is dodged, those in close proximity can still be temporarily distracted by its intensity.
There are no "" in the text around light though this is the original text with no bolding or editing