Arcane Augmentation

Using your arcane know-how, you augment the effects of one simple or martial weapon you’re holding. Choose one damage type when you cast this spell: acid, cold, fire, lightning, poison, or thunder. Until the spell ends, you deal an extra 1d6 damage of the chosen type to any target you hit with the weapon; this weapon's damage counts as magical damage for the spell’s duration. As a bonus action, you can change the damage type to one of the options listed above.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, you can maintain your concentration on the spell for up to 8 hours.