Skiens Island

So I was exploring the new Skiens Island, and I found a few weird things. I didn't explore every room, but here is everything that I found:

when you enter this door and then the door on the right, you find this:

I have been looking for the code a bit, but all I found was this (haven't explored all the rooms) :

You can get here by entering this hallway thing:

I also found this, but I don't really know if it's a hint, or just some lore:

(you can get there by just entering a normal room)

I haven't done any of the new quest yet, so sorry if this is just a part of a quest :P

 

The code is 5283, I've been all through that area, it's pretty interesting, a cool boss dude and everything, couple loot chests also

 

This is a point of interest and should be investigated further sometime, seems interesting.

What is the boss and does it give any rewards that could be linked to this?

 

Ok thanks, has nothing to do with ??? ?

 

Nope, but then again I might've missed something, so it doesn't hurt to look again.

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Boss is a Skiens Commander and a Traitor's Ghost, the commander drops I think Skiens set armor.

 

Neat, I'll need to go get that armor set myself some time in the future.

 

No, the boss is General Skien, Skiens Commander is an add.

 

Oh whoops