You form and condense an active storm between your hands. Upon casting and on subsequent turns, you can use a Magic action to cause a 30-foot-long, 5-foot-wide Line of lightning to lash out from your hands in a direction you choose. Each creature in the Line makes a Dexterity saving throw, taking 4d6 Lightning damage on a failed save or half as much damage on a successful one.
Alternatively, you can focus on the storm and enhance its power upon casting the spell or as a Magic action on a subsequent turn. When enhanced, the storm will deal an extra 4d6 Lightning damage once released. If concentration is lost while focusing the storm, it explodes in the casters hands in a 15 foot Emanation. Each creature in the Emanation, including the caster, makes a Dexterity saving throw, taking 4d6 Lightning damage on a failed save or half as much damage on a successful one.
Using a Higher-Level Spell Slot. The damage increases by 1d6 for each spell slot level above 3.
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