You call down a bolt of crackling lightning onto a designated point within range. The initial strike deals 4d8 lightning damage to any creature in that space that fails a Dexterity saving throw (half damage on success).
At the start of each turn (for up to 3 turns), the lightning arcs outward, striking adjacent 5-foot spaces per round. Any creature in those spaces must also make a Dexterity saving throw or take 3d8 lightning damage (half on success). The lightning continues spreading each turn, targeting a new adjacent spaces, forming an unpredictable chain of strikes.
After 3 turns, the residual energy dissipates, leaving faint scorch marks and a lingering static charge in the air.
At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the initial damage increases by 1d8 per slot level above 4th, and the subsequent arcs increase by 1d6 per slot level above 4th.
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