Tasha's Translucent Trebuchet

Upon casting this spell a translucent, light refracting trebuchet appears in a place on the battlefield of the casters choosing within 100 feet of the caster. The other characters on the battlefield must make a DC 15 perception check to notice the trebuchet. If noticed the character will have advantage on their Dex save against the trebuchet until its location is changed. Upon a failed save at 3rd level this spell will do 8d8 psychic damage and half as much on a successful one. The caster can use a bonus action to move the trebuchet up to twice the casters movement. The range of the trebuchet is 500 feet and it hits a ground area of 30ft radius from its center most point. At higher levels the perception check grows by 3 and the damage grows by 2d8.