at (H-7) there is a drop down point where you can go up a ramp and access a higher level of the area. From there, head to (I-12) and the series of rooms SW of that, where Yagudo Priests, Votarys and Theologists are found. Took the help of a few campers of Hjuu Mjuu the Torrent to find this place for my Giddeus Chest Key.