Tailed Beast Bomb

You surround yourself in magic as an ethereal head of a beast forms around you, the look of which you decide when casting this spell. The beast then opens its mouth as it condenses a massive amount of magic, forming a large ball of intense purple energy. You then have the beast launch the ball at a point you can see within a 450ft range. The ball explodes on impact with a detonation equaling that of a sphere with a 100ft radius the creature/s takes 25d10 force damage