You unleash an arcane calamity that tears open the skies in a 300-foot radius centered on a point within range. Each creature in the area must make a Constitution saving throw. On a failed save, they take 20d10 Arcane damage and are knocked prone. Structures and magical wards in the area are automatically hit and must make saving throws as appropriate or be destroyed. On a success, creatures take half damage. The land becomes warped and unstable for 24 hours, causing tremors and difficult terrain. Spawns arcane creatures that corrupt the land.