lurker wrote:Even with these hints I'm still not getting it.
So "they" are the four, so 2 + 2 = 4, right? There are three alcoves so I've tried 2kg in 2 of them and 4kg in the other. I've tried 2 and 4 items and even tried it where each item is 1kg so I have 2 items totally 2kg, etc. No dice.
The other riddle is completely beyond me.
Your math does not match the hints. All of them must apply.
While 'they' are the sum and the four your sum is eight.
lurker wrote:Also, I've managed to get stuck in the maze.

So the pit in front of the party and the other pit off to the right without the question mark are both open. How do I close the pit off to the right? I thought of the doing The Runner again, but the button by the ethereal blade doesn't do anything anymore.
Also, how
do I open the pit with the question mark? Haven't figured that one out yet.
The pit in front of your party is easy to close: the lever for it is straight ahead, past pit and bridge.
Once the pit to the right is open it stays open. Yet you are not stuck. You can still reach that lever by going all the way around, passing The Runner, The Tenacious and The Evasive; just tried it myself.
The pit with the question mark opens once you solved the maze.