Amadeus Wolfgeist

Amadeus Wolfgeist is the fifth boss encountered in Luigi's Mansion 3. He is encountered and fought on Floor 4 after Luigi locates him in the Great Stage. Defeating Amadeus Wolfgeist rewards Luigi with the elevator button to the sixth floor as well as freeing one of the imprisoned Toads. His name is based on that of composer.

Appearance
Luigi finds an unmanned piano playing, as well as one of the Toads' portraits on the stage. He attempts to get on the stage, although Amadeus Wolfgeist appears and, upon noticing Luigi, briefly gets annoyed at his presence and proceeds to rapidly play the piano to scare Luigi off the stage, smirking once he did so. Upon seeing that Luigi evaded his chair attack, he'll express displeasure before resuming playing the piano to summon ballerina ghosts. After the ghosts are defeated, he then completely loses his temper and proceeds to confront Luigi personally by possessing his piano.

Battle
The first phase requires that the player dodge various levitating seats as Amadeus is playing the piano. It is done in sets of three, though in the final portion, all five remaining sets are levitated and thrown.

The second phase requires the player to confront blue ghosts posing as ballerinas. Two ghosts appear initially. As they are wearing ballet masks, they are initially immune to the flash, requiring that the player knock them off before flashing them and sucking them in. He'll then summon three more, with the rest of the phase requiring defeating them.

The third phase requires fighting against the piano. He'll hop around inside the piano, eventually opening himself up and leaving him vulnerable to a flash. However, in order to draw him out longer, the player has to shoot bombs that the piano launches out back inside the piano, stunning it long enough to allow Luigi to use his plunger launcher at it and then forcibly yank it onto the floor. Afterwards, Amadeus will be exposed and try to grab or burn the player, although he can easily be stunned with a flash and then sucked in. He then repossesses the piano and will launch keyboard missiles (how many shots depending on how much health he has lost by that point). Once he is defeated, he'll claw and eventually just give up and let himself be sucked in. Luigi will then retrieve both the sixth floor button as well as free the red-spotted toad, with Polterpup activating the steps to allow Luigi up.