---- FUSES ----
In the room with double tap, on a table
In the basement with the cell door puzzle
On a small table in the long hallway on the first floor
In the toilet in the bathroom on the first floor

---- RITUAL ITEMS ----
Gateworms:
In the basement behind one of the cell doors (requires you to have power turned on)
Storage room connected to the long hallway on the ground floor
Storage room connected to the lounge with the jukebox on the first floor
On a barrel at the top floor
Summoning book:
In the room with the sarcophagus

---- MISSING ITEM... for the sarcophagus ----
On a statue outside the manor