Demiguise Dread Trophy in Hogwarts Legacy

There are 33 Demiguise statues, called Demiguise Moons in the game. The Caretaker's Lunar Lament gives the first three. The rest are in houses in the villages and Hogsmeade and in rooms of the castle, many behind locked doors. A statue can only be picked up at night, when it glows blue: open the map and wait with R3. Statues are not marked on the map, but the fully zoomed-out map shows each region's count at the top right.