There are 33 Demiguise Statues in Hogwarts Legacy and they are not marked on the in-game map.
Demiguise Statues are small in size, figurines of a creature squeezing a large blue orb called Demiguise Moons, it's the Demiguise Moons you'll be collecting. They can be collected only at night, when they glow blue.
You can start to collect them after "The Caretaker's Lunar Lament" Main Quest later in game.
They are related to "The Man Behind the Moons" Side Quest, but more importantly, they are needed to upgrade the Alohomora spell, which will allow you to open higher level locks.
After completing the "Percival Rackham's Trial" Main Quest you will receive an Owl Post from Gladwin Moon requesting an encounter.
Go to meet Gladwin Moon and start "The Caretaker's Lunar Lament" Main Quest - while doing this quest you will learn Alohomora Spell Level 1 to unlock Level 1 Locks.
After "The Caretaker's Lunar Lament" Main Quest, Gladwin Moon will give you "The Man Behind the Moons" Side Quest which will allow you to learn Alohomora Spell Level 2 Locks after finding the 9 Demiguise Moons, and Alohomora Spell Level 3 Locks after finding next 13 Demiguise Moons.
Achievement Demiguise Dread
All Demiguise Statue Locations in Hogwarts Legacy
You can start to collect Demiguise Moons from Demiguise Statues after "The Caretaker's Lunar Lament" Main Queste given by Gladwin Moon.
Remember that you can collect Demiguise Statues only at night. When it's dark, cast the Revelio spell and Demiguise Statues nearby will glow blue on your screen, even if they're behind walls.
Demiguise Statue in Hogwarts Legacy
First 3 Demiguise Statues you will get in The Caretaker’s Lunar Lament Main Quest. Gladwin Moon will take two from you, the third will be left in Inventory
01Hogwarts Castle Collected during The Caretaker’s Lunar Lament Main Quest
02Hogwarts Castle Collected during The Caretaker’s Lunar Lament Main Quest
Start The Man Behind the Moons Side Quest given by Gladwin Moon.
03Hogwarts Castle stays in inventory after The Caretaker’s Lunar Lament Main Quest.
04South Hogwarts Region in Aranshire, inside a house.
Demiguise Statue - South Hogwarts Region in Aranshire.
05South Hogwarts Region in Lower Hogsfield inside a house.
Demiguise Statue - South Hogwarts Region in Lower Hogsfield
06Hogsmeade Valley in Upper Hogsfield, inside a house.
Demiguise Statue - Hogsmeade Valley in Upper Hogsfield
07North Ford Bog in Pitt-Upon-Ford, inside a house.
Demiguise Statue - North Ford Bog in Pitt-Upon-Ford
08Hogwarts Valley in Brocburrow, inside a house.
Demiguise Statue - Hogwarts Valley in Brocburrow
09Hogwarts Valley in Keenbridge, inside a house.
Demiguise Statue - Hogwarts Valley in Keenbridge
10Hogwarts Castle Professor Fig’s Classroom, in his office.
Demiguise Statue - Hogwarts Castle, Professor Fig’s Classroom
11Hogsmeade inside Tomes and Scrolls.
Demiguise Statue - Hogsmeade in Tomes and Scrolls
Now you should have 9 Demiguise Moons in your inventory. Return to Gladwin Moon for next step in The Man Behind the Moons Side Quest.
He will teach you Alohomora for Level 2 Locks.
The next step is to find another 13 Demiguise Statues to learn Alohomora for Level 3 Locks.
12Hogsmeade inside a house, Level 2 Lock
Demiguise Statue - Hogsmeade inside a house
13Hogsmeade inside Hog’s Head Pub
Demiguise Statue - Hogsmeade inside Hog’s Head Pub
14Hogsmeade inside a house, Level 2 Lock
Demiguise Statue - Hogsmeade inside a house, Level 2 Lock
15Hogsmeade inside a house on second floor, on back of The Three Broomsticks, entrance to house frome North side.
Demiguise Statue - Hogsmeade inside a house
16Hogsmeade in Dervish and Banglesm.
Demiguise Statue - Hogsmeade in Dervish and Banglesm
17Hogsmeade in last house on east side.
Demiguise Statue - Hogsmeade last house on east side
18Hogsmeade inside a house, near bridge, on north side.
Demiguise Statue - Hogsmeade inside a house near bridge
19Hogsmeade inside a house.
Demiguise Statue - Hogsmeade inside a house
20Hogwarts Castle The Great Hall, door with Level 1 Lock on west side.
Demiguise Statue - Hogwarts Castle, The Great Hall
21Hogwarts Castle Long Gallery, Start from Bell Tower Courtyard Floo Flame in The Bell Tower Wing, use door on left side of Floo Flame, go SE through the door and follow the long corridor straight ahead, almost to the very end, until you find the door on right side with Level 2 Lock.
Demiguise Statue - Hogwarts Castle, Long Gallery
22Hogwarts Castle Beasts Classroom in The Bell Tower Wing, inside right smaller building, Level 2 Lock.
Demiguise Statue - Hogwarts Castle, Beasts Classroom in The Bell Tower Wing
23Hogwarts Castle Hogwarts North Exit in The Bell Tower Wing, go back through the gate inside, then go E along the walls, until you find the stairs, there is a door under the stairs with Level 1 Lock.
Demiguise Statue - Hogwarts Castle, Hogwarts North Exit in The Bell Tower Wing
24Hogwarts Castle Defence Against The Dark Arts Tower. Go to Transfiguration Courtyard in The Astronomy Wing, use door near flo flame and enter Defence Against The Dark Arts Tower, straight to W door with Level 2 Lock.
Demiguise Statue - Hogwarts Castle, Defence Against The Dark Arts Tower
Now you should have 13 Demiguise Moons in your inventory. Return to Gladwin Moon for next step in The Man Behind the Moons Side Quest.
He will teach you Alohomora for Level 3 Locks. Level 3 is last level of Alohomora