Voltaic Vault

From your palm, spawns a swirling orb of arcing lightning which vaults towards a point you choose within range and swells into a raging storm. Each creature in a 20-foot-radius centered on that point must make a Constitution saving throw. A target takes 8d6 lightning damage on a failed save, or half as much damage on a successful one. Creatures wearing metal armor or creatures made of metal have disadvantage on this saving throw.

The lightning arcs around corners. It electrifies surfaces and objects that aren't being worn or carried.

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