Wrath of The Cursed Gods

Channeling the overwhelming cursed power of the book, you create a massive ball of incredibly destructive energy that launches forwards and explodes in a 500 ft radius. The explosive energy does not care who is caught in its blast, decimating anyone or anything in its path, leaving a small crater in its wake. The blast deals 15d20 force damage to whoever or whatever is caught in its radius. All spell slots must be full as using this spell will expend all of them. The spell also knocks the user prone for two turns. The user also has level one exhaustion applied.