Weapon of Tactical Precision

You infuse a mundane weapon with the swiftness of the wind and deadliness of a true assassin. At the end of the 1 hour ritual, you touch a nonmagical weapon. Until the spell ends, that weapon becomes a magic weapon with a +1 bonus to attack rolls and damage rolls, and the wielder of the weapon uses its Intelligence modifier for attacks and damage rolls instead of its previous attack and damage 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.