Warpstorm

A sphere of crackling green energy erupts at a point you choose within range. Each creature in a 20-foot-radius sphere centered on that point must make a Dexterity saving throw. A creature takes 8d6 lightning damage on a failed save, or half as much on a successful one.

The unstable warp energy makes the spell unpredictable. Roll a d6 when you cast this spell:

• 1: The spell backfires, and you take half the total damage of the spell.
• 2-5: The spell functions normally.
• 6: The spell overcharges, and you can choose one of the following effects:
  • The damage increases to 10d6.
  • The radius expands to 30 feet.
  • You can redirect the spell’s energy—after the initial blast, choose a point within 30 feet of the explosion. A second smaller burst occurs there, dealing 4d6 lightning damage in a 10-foot radius (no additional spell slot required).

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 per slot level above 3rd.