Don't kill the Wandering Nightmares if you want to farm chunks.
Floor 1
Research Hall lamp
If you talked to Ludwig's head while wearing church attire.
Wandering Nightmare (floor)
Wandering Nightmare (steps)
Floor 3: East Side
Floor 2: East Side
:? Laboratory Floor 2
:? Out on the balcony.
Laboratory Floor 1
:? To get here, go up to Laboratory Floor 3 and take the right-side elevator down.
Door
:i To Floor 1
Floor 2: West Side
:# Patient Room (dark)
:i The small, dark room with 6 beds and several Clocktower Patients.
Clocktower Patient (kneeling)
Clocktower Patient (sidways)
Clocktower Patient (corner)
:? Patient Room (light)
Floor 4
:? Climb up the ladder in either Patient Room Floor 2.
:? Patient Room (light)
Floor 5
Rafters
Guidance (+1)
:? Dropped by the Carrion Crow that falls on to the window ledge from the upper rafters.
:i This is the only rune in the game that can be acquired more than once in subsequent (NG+) playthroughs.
Pull the lever
:i Raises the central column and all stairs with it one floor up.
Upper Rafters
Central column raised
Floor 6: Platform
Floor 4: Central Column
:? You can now reach this from Floor 5.
Floor 1
Lethal Damp Blood Gem (5)
:# q Adeline
-
Give her Brain Fluid
-
Leave the are and come back 3 times
-
Give her Brain Fluid
:# Balcony Key
-
Leave the are and come back 3 times
-
Give her Brain Fluid
:? Now that she's an Enlarged Head, you can kill her to get the third Brain Fluid, and give it back to her when she comes back to life.
:#
yMilkweed
1st Floor Balcony
Requires Balcony Key.
:# Recovery Hall walkways
:? Left walkway.
Pulsing Damp Blood Gem (5)
:? Right walkway, jump over the gap.
Floor 2: Platform
Floor 3: West Side
:? You can now access the west side of the 3rd floor by jumping off the middle East Side platform.
:i Gives access to the locked cells in the Nightmare Clinic.