Terran Rail Gun (Legendary): Taken from the fiction of your world, this spell will temporarily create a cylindrical projectile of pure adamantium, weighing approximately 12.5 tons. The spell will attempt to accelerate the projectile through a series of magnetic fields, up to 99% the speed of light. Optimal range for this projectile is 100,000 miles, but it can be used at a minimum safe distance of 100 miles. If used on Earth the shockwaves caused will be limited to 99 miles from ground zero. This spell can destroy cities.
I’m no expert but I feel this object described at that velocity would destroy a planet or maybe even a star, much less a city. Probably could fix this why reducing the size of the object being accelerated.
