As with the previous stage, all enemies will respawn when defeated.
The first task is to find the bottle with sleeping gas. Head northwest, then north east to find it.
Return to the main corridor, and continue northwest for one more room. Take the next northeast exit and continue unitl you see a room filled with vases. Select the flower, and put it in the norhtern most vase to open a secret door. Enter.
The secret passage is guarded by a dog. It is immune to weapons, but can be taken out with the bottle. It may be difficult to hit, but you can try throwing it when it begins the approach. Back up if you miss, as the dog will instantly take you out.
In the next room is a statue of an archer, which will kill you if you try to pass. To sneak past it, you need to look for red dots on the floor, and touch them. As long as you glow red, you can pass the statue without issue.
Proceed up the stairs, defeat the last guard, and enter the next room.
The final battle will be against Kunitoki. Unlike other rooms, you can't kite enemies by retreat and re-entering, and thus you will have to fight him directly. Make sure you choose the correct weapon before you enter melee range, as you won't be able to change once he gets close. You can defeat him with any attack, but use the one that inflicts damage as quickly as possible.
When he is down, you will be brought to the final room. Approach the scrolls, stopping just before the large outer square. Jump into the middle, approach the altar, and collect the scrolls.