Dragon Lightning

A bolt of lightning strikes a creature or object you can see within range.  Make a ranged spell attack against the target.  You have advantage on the attack roll if the target is wearing armor made of metal.  On a hit, the target takes 8d12 lightning damage, and it can't take reactions until the start of its next turn. 

At Higher Levels.  When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d12 for each slot level above 5rd.