Thral's Hammer of Thor

You create a glowing hammer of thunder and lightning.  Roll a ranged spell attack to hit a creature that you can see within range.  The hammer deals 2d8 thunder damage and 2d8 lightning damage to its target. 

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the spell does an additional 1d8 thunder damage and an additional 1d8 lightning damage.  The spell will do an additional die of damage of each type  for each other slot level above after 5th level, ie 7th and 9th