You make the object Invisible. This makes it Undetected to all creatures, though the creatures can attempt to find the target, making it Hidden to them instead if they succeed. If the item is used as part of a hostile action, the spell ends after that hostile action is completed. Making a weapon invisible typically doesn't give any advantage to the attack, except that an invisible thrown weapon or piece of ammunition can be used for an attack without necessarily giving information about the attacker's hiding place unless the weapon returns to the attacker.
Heightened (3rd) The duration is until the next time you make your daily preparations.
Heightened (7th) The duration is unlimited.
Traits
An action with this trait requires a degree of mental concentration and discipline.
Effects and magic items with this trait involve false sensory stimuli.
You must physically manipulate an item or make gestures to use an action with this trait. Creatures without a suitable appendage can't perform actions with this trait. Manipulate actions often trigger reactions.