The Varnų Karalienė's Radiating Blade

You call upon the Varnų Karalienė to grant you the ability to strike down your foes in her name. Using your bonus action, you're able to sheathe a melee weapon you possess with a white or black burning flame. You can use your action to make a melee attack with the fiery blade. On a hit, the target takes the weapon's normal attack damage + 1d4 radiant + 1d4 necrotic damage. The flaming blade sheds bright light in a 10ft radius and dim light for an extra 10ft.

At Higher Levels. When you cast this spell using a slot of 3rd or higher, the damage increases by 1d4 of each damage type for every 2 slot levels above 2nd.