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.
The PCs see a large oak tree, a curious species of yellow and black butterflies swarm around it. Upon further inspection they find that the tree is hollow and that there is an underground cave in it from which the butterflies appear. Will they inspect this strange cave?