Astral Blade

You call upon the celestials to grant you a divine weapon. The blade resembles a longsword, and it lasts for the duration. If you let go of the blade, it disappears, but you can evoke the blade again as a bonus action.

You can use your action to make a melee spell attack with the divine blade. On a hit, the target takes 2d8 radiant damage. Additionally, you can make an attack as a bonus action immediately after casting a spell.

The righteous blade sheds bright light in a 10-foot radius and dim light for an additional 10 feet. 

At Higher Levels. When you cast this spell using a 3rd- or 4th-level spell slot, the damage increases to 3d8. When you cast it using a 5th- or 6th-level spell slot, the damage increases to 4d8. When you cast it using a spell slot of 7th level or higher, the damage increases to 5d8.