A storm cloud 360-ft-radius forms overhead (Concentration, 1 min). Each turn you can choose to intensify the storm. Turn 1: deafening thunder (CON save or Deafened), 2d6 Thunder. Turn 2: lightning bolts (each creature DEX save, 3d10 Lightning). Turn 3: freezing hail (STR save or Restrained, 1d6 Cold). Turn 4: shrieking rain (Concentration check DC 15). Turn 5–10: acidic rain (1d6 Acid). Turn 10: mass Prone from final thunder.