Energy Beam

A 120 ft. long and 5 ft. wide line of crackling, blue energy lances out. Any creatures in that line must make a Dexterity saving throw. On a save fail they take 1d12 +(spell modifier) lightning damage. On a success, they take half damage. 

After casting this spell, you must make a con save against your spell save DC. On a fail, you are stunned for a round.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the initial damage increases by 2d12 for each slot level above 1st.