The noise continues inside the piano. The human revealing spell reveals….dramatic drumroll please… no humans. Thankfully for you. The second spell you use doesn’t reveal anything, either, but not because magic isn’t present; things are just made more difficult for you champions. This would be way too easy if that spell worked. But magic always leaves a trace, even when hidden the most carefully.

A few things happen at once. The lid to the piano is opened, you press the keys, and the sound continues even with the lid open. There is something black, a material of some sort, making the noise whenever the keys are pressed.

It flutters slightly at being discovered.