Chill Blade

You imbue ice energy into a weapon for up to a minute as a bonus action. You can attack with it at your next turn. The spell ends after a minute or when you use it, you deal an extra 4d6 of frost damage to any target you hit with the weapon. If the weapon isn’t magical, it becomes a magic weapon for the spell’s duration. While charging the flames you gain disadvantage on dexterity saving throws.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, you can maintain the spell for up to 10 minutes and increase damage by 3d6