Ashe's Spell Sword

You touch a nonmagical bladed weapon and an arcane spellcasting focus, fusing them into a single weapon for the duration of the spell. Until the spell ends, that weapon becomes a magic weapon with a +1 bonus to attack rolls and damage rolls. You gain proficiency with this weapon and when you attack with this weapon, you may use your spellcasting ability, instead of Strength or Dexterity, for the attack and damage rolls. Additionally, you may use the weapon as a spell focus which grants a +1 bonus to spell attack rolls.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the bonus increases to +2. When you use a spell slot of 7th level or higher, the bonus increases to +3.