I've finally had time to finish the dungeon. Over all I've had a great time playing, though the four alcoves with text riddles on the wall annoyed me greatly.
My son solved if for me by simple adding 1kilo at the time until the door opened. We couldn't figure the last one out from the text.
I have no idea what the water orbs are for (and I've only found 10 out of 14 secrets). The first time I went into the high ranking clerics area I got experience points because the water orb protected me, but, I hadn't found any water orbs at that point. I find that very odd.
I also find the ending a bit abrupt and it sort of stumped me. Not a big deal though.