The crystal grows to cover the dagger you are holding, extending its blade and imbuing it with arcane power. For the duration, you can use your spellcasting ability instead of Strength for the attack and damage rolls of melee attacks using this weapon, and the weapon's damage die becomes a d8. The weapon also becomes magical, if it isn't already. When you hit a creature with this weapon you can choose to have it deal either slashing or piercing damage.

The spell ends if you cast it again or if you let go of the weapon.

Cantrip Upgrade. The damage die changes when you reach levels 5 (d10), 11 (d12), and 17 (2d8).