Amnesia: The Dark Descent Walkthrough: Nave (and making of the Tonic)

Congratulations! You’ve just gone through another thrilling chase! Now
it’s time to make Agrippa’s Tonic. Move forward. There’s a note on the
left and a tinderbox. Grab it and read the note.

Daniel will faint and remember about the people he actually caused to
suffer. In this vivid flashback, go ahead and keep moving forward to the
houses.

After regaining consciousness, move forward and go through the door.
The castle is becoming more filled with the red organic matter. Continue
on and go through another door.

We’re now back to the area where we crawled out of a well. There’s a
tinderbox on top of the well, grab it. Move forward. The door to our
left is blocked by rocks. Continue forward and open the door. There’s a
lot of red organic matter on the ground. Run and then jump forward, then
quickly crouch to pass under the wood. Go through the door.

We’re now back to the spiral stairs. Keep moving to reach the bottom.
Remove the barrel blocking the door and go through. Be careful of the
red organic stuff.

After entering, look to the right. Remember the Laboratory? Now it’s open!
Go inside the Laboratory. The shelf on left side has a tinderbox, grab it.

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Mixing Agrippa’s Tonic Solution:

Inside the Laboratory are three scientific tools. One on the left, one
in the middle, and one on the right. Go to the device on the right. Open
your inventory and use the Glass Jar of Blood on it. Turn the valve. When
it’s done being heated, grab the jar to have the Incomplete Tonic.

Next, go to the device in the middle. It has a lever, and the square part
of the device can be opened. Open this. Open your inventory and put the
Remains inside this square thing. Close the square thing. Open your
inventory and use the Incomplete Tonic on the square thing. Now pull the
lever. Grab the Incomplete Tonic afterwards.

For the last part, let’s go to the device on the left. Open your inventory
and choose the Incomplete Tonic. Use it on the device. Next, open your
inventory and choose the Poison Gland and use it on the device. Now turn
the crank on top of the device until it squishes the Poison Gland.

Congratulations! You have finally made Agrippa’s Weyer’s Tonic! Grab it!
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Exit the room and continue forward. Go through the door and down the
stairs so that we can see Agrippa again. He will tell you that the
Laboratory might be accessible now. Of course we’ve been there already.
Wait a bit and he’ll tell you that you can feed him the tonic and you can
decapitate him afterwards so you could take his still living head with
you to fight Alexander.

Open your inventory, choose Weyer’s Tonic, and use it on Agrippa. Now
turn left and move through the new hole because we’ll need to find the
saw to cut off Agrippa’s head. In the new room, go to the shelf and grab
the Bone Saw.

Exit the room through the hole and go to Agrippa. Use the Bone Saw on him!
After cutting, pick his head up from the ground.

Turn right and head straight. Go through the door, we’re going back to
the Chancel where we got ambushed the first time. Go through the door to
get into the Chancel.