Last area - how am I doing?

[Hguols]

The red flash and the switch in the axe room signifies that you complete it. That, and you saying you dissolved the hands and got that switch, let me throw this hint at you again.

"ribs" isn't the keyword on that wall writing - "unearth" is. ....when it comes to your 3rd and final switch.

As for the water area - did you try to arrange the masks on the wall the same way as they appear arranged behind the pillars?

Have you tried to move those masks on the wall with both pillars down?
...with the left pillar up only?
...the right pillar up only?
...both pillars up?

^_^