Brassicannihilation

You hurl an arcane cabbage bathed in a divine aura, exploding in holy light upon impact. Make a ranged spell attack against one creature or object in range. On a hit, the target takes 5d10 Radiant damage.  Those affected by splash damage take 3d10 damage if adjacent to the impact, 2d10 if one square if diagonal from the impact, and 1d10 if two linear squares from the impact.