Energy Blade

You manifest a blade of energy in your free hand. The blade is similar in size and shape to a longsword, and it lasts for the duration. If you let go of the blade, it disappears, but you can manifest the blade again as a bonus action. 

You can use your action to make a melee spell attack with the fiery blade. On a hit, the target takes 2d6 acid, cold, fire, lightning, or thunder damage (your choice).