One weapon you touch grows eyes, tentacles, and other aberrant features. At the end of each of your turns while this spell persists, you may choose to add a d4 to all following attack or damage rolls made with the target weapon. There is no limit to the number of d4s this spell can add to your attack and damage rolls, but you lose all bonuses granted by this spell when it ends. 

At Higher Levels: When you cast this spell using a spell slot of 3rd level, the d4 bonus granted by this spell increases to a d6. When you use a spell slot of 4th level, the bonus becomes a d8. When you use a spell slot of 5th level or higher, the bonus becomes a d10.