You coat a weapon you touch with illusory magicks, rendering it invisible to all except you and the creature who is carrying or wielding it. Until the spell ends, any weapon attack made using the weapon against a creature other than you that doesn’t have truesight has advantage. If the weapon isn’t already a magic weapon, it becomes one for the duration. Even if it was already a magic weapon, spells and magical effects that detect the presence of magic items or whether an item is magical or not, such as the detect magic spell, fail to detect the weapon.