Din's Arc of Energy

You conjure a beam of crackling yellow energy which arcs towards a target within range. The target must make a Dexterity Saving Throw, on a failed save taking 3d12 Lightning damage or half as much on a success. On a hit the target must also make a Strength Saving Throw or fall prone. The beam of energy, if it hit originally, will then arc to another creature of your choice within 30ft, subjecting that creature to the same effects. The beam can repeat this again twice more on different creatures each time.

When you cast this spell using a spell slot of 4th level or higher, the beam will arc to one more target for each slot above 3rd.