tbh there is no way this can be balanced
why on earth there should be something giving x extra attacks? even if there is a chance to miss still there would be a chance to attack n times..
nonsense
also there is already one cool skill for assassins like allowin double attack, thats already OP imo and its just 2 and its a skill you cant use always
really no way a propriety of a weapon allow the normal attack to multiply, it makes no sense