While technically alive, magnagogs have little in the way of personality and are driven via telepathic command.
Most folk would call an argillomatus a clay golem. They would be wrong.
Chekov's Spell -- This spell has a two-fold effect. The first is to make the target item almost-unnoticeable to anyone not specifically looking for it. The second is that someone who has seen the item will remember it when they encounter a situation that would be perfectly solved by use of said item.