Like other boss missions before, Luigi will be pixelated directly to the general area of the boss's location. If Luigi peers into the window, he will see that the Shrewd Possessor has disappeared, and there is nothing but a large sheet of ice on the floor. Once Luigi enters the room, the Possessor comes up to him, scares him, and dives right into the ice sheet. The ice sheet then turns into a ferocious ice monster, and dives down into the Frozen Pit. The sled-mounted shooter appears next to Luigi, Luigi gets on top of it, and the battle commences.
In battle, Luigi must fire a bomb at each of the ice sheets covering the ice monster's face, aiming with the gyro inside of the 3DS. However, the ice monster dives deeper into the pit every time one of the ice sheets on his face is destroyed, and if Luigi fails to destroy the ice sheets in time, the ice sheets will reform. Also, if Luigi shoots too many bombs, the machine will overheat, and it will give Luigi an instant Game Over. Once Luigi destroys the 8 ice sheets covering the monster's face, it will attempt to bite Luigi. Luigi must fire a bomb into its mouth in order for the Possessor to reveal itself.
Like other Possessors before, the Shrewd Possessor attempts to attack Luigi by ramming into him; though, this possessor has the ability to create portals which follow Luigi. After the Possessor fails to attack Luigi three times, it is stunned, and Luigi is able to attack it. Once Luigi removes its white coat, the Possessor goes back into the ice monster. The next two battles with the ice monster and the Possessor are largely the same, except the ice monster gets one more sheet of ice covering his face each time. Once the Possessor is defeated, Luigi is rewarded with the Dark Moon piece of the Secret Mine. More fog clears up as Luigi arrives in the Bunker, and Luigi is now able to visit the final mansion in the game, the Treacherous Mansion.
The possessor is trying to get away, and the sled is overheating! Catch him, and retrieve the Dark Moon piece!
Bingo! I've found the possessor ghost hiding in the Workshop! And if we've learned anything, it's that where there are possessors, there are Dark Moon pieces!
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