Arcane Weapon Mastery

You can use your spellcasting ability instead of Strength or Dexterity for the attack and damage rolls of melee attacks using your Arcane Weapon

Your Arcane Weapon also becomes magical, if it isn't already.

You can transform one magic weapon into your Arcane Weapon by performing a special ritual while you hold the weapon. You perform the ritual over the course of 1 hour, which can be done during a short rest. The weapon ceases being your Arcane Weapon if you die, if you perform the 1-hour ritual on a different weapon, or if you use a 1-hour ritual to break your bond to it.