SPOILER Mysterious door

Upon beating The Wartorn Palace for the first time, a door in the palace opens. This door leads to another door, described as a "strange door locked by a bizarre runic seal," by the game. Interacting with it while holding one of each Rune gives you an added dialogue option, but the door does not open.

I have tried interacting with it while carrying the entire Forgotten Chronicles set (which has ties to the Runes,) but nothing new happened. I have a theory that interacting with it while holding Az (the bow) might give us more information, but I do not have one on hand, and I do not want to spend money on something that might not work. If you have an Az and it does add a new dialogue option, please share it.

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There are also two other Rune-related dialogues, one for having some, but not all, and another for having just one. They do not yield interesting results.

 

It's confirmed not to be implemented yet.

 

I imagine it'll be implemented with the Wastelands, whenever that releases.