Crackle

You create three arcs of lightning striking targets in range. You can direct them at one target or several. Make a ranged spell attack for each arc. On a hit, the target takes 1d12 lightning damage. If someone is hit with two or more arcs, they must make a constitution saving throw. If they fail, they are restrained until the end of their next turn. If they are hit by all 3 arcs, they are instantly paralyzed until the end of their next turn. 

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, you create one additional arc for each slot level above 2nd.