All 5 Keys Location
1 Master Key
Location: Rooftop (Ladder required, solve The Seven Deadly Sins puzzle in Manor Attic)
Unlocks: Room 201 till 206 except Room 204
2 Omnious Key
Location:
1. After completing "Damsel In Distess", go to Manor Dining Room, wait for the blue key to appear,
2. Then, go behind the manor and pick up.
Unlocks: Manor Dungeon (push the bookshelf in Manor Living Room to reveal the entrance to Secret Stairwell)
3 Blood Key
Location: Manor Frontyard (behind the forest gates, top right corner)
Unlocks: Maze Entrance (Gasstop)
4 Bone Key
Location: Manor Main Hall - Automatically available after completing "Shining In The Darkness" quest, the man statue
Unlocks: Manor Attic (access from Manor Upstairs)
5 Mysterious Key
Location: Manor Upstairs - push glass display cases right to left
Unlocks: Manor Crypt