Hello and welcome to the guide for the part of the Chasm Monastery in which you have to get through a trap door in the floor.
Watch on YouTube: http://youtu.be/zkIOWrFhtA4
Previous: Hall of Ascension Puzzle Guide: http://wp.me/p1SfP0-1sj
To open the trap door drop the bell onto it. First go up to the second level using the walkway at the back of the room. Only open one of the two windows, I started with the one on the right:
Shoot the ball with the rope wrapped around it with the alternate fire of the bow which launches an arrow with a rope attached to it. Pull the ball backwards to destroy the left pillar:
Now close the right window and open the left and repeat the process for the right pillar. Now a number of enemies come at you the same way you used to get to the upper floor. I found it best to use the shotgun to deal with them. At the end open both windows and draw back the ball and let it destroy the wooden bar holding up the bell. Now the bell will drop and you can continue.
Next: Well of Tears: http://wp.me/p1SfP0-1sE