In total, not including those from the quest, 30 Demiguise Moon Statues can be found in Hogwarts Legacy, 10 of which are located in Hogwarts Castle.
Demiguise Moon Statues become available after "The Caretaker's Lunar Lament" main quest and they can only be collected at night. Demiguise Moons are needed to learn the higher levels of Alohomora spell. This will allow you to open higher level locks.
Demiguise Moon Statue #1It's on a small table standing next to the fireplace.
Demiguise Moon Statue #2The statue stands on the desk located further into the room.
Demiguise Moon Statue #3It's on the dresser.
Demiguise Moon Statue #4It's inside a locked (Level 1 Lock) room.
Demiguise Moon Statue #5It's on the table, in a small locked (Level 1 Lock) room.
Demiguise Moon Statue #6It is in a secret room, hidden behind one of the toilets in the Haunted Toilets area (Level 1 Lock).
Demiguise Moon Statue #7It's inside a small locked (Level 1 Lock) cell.
Demiguise Moon Statue #8It's inside a small locked (Level 2 Lock) room.
Demiguise Moon Statue #9It's in a locked room (Level 2 Lock), on the desk.
Demiguise Moon Statue #10It's in the locked (Level 2 Lock) Professor Howin's Office.
