Halhace sighs and face palms at the people he us stuck with. "Is it truly so hard to stay together. Everytime one of these fools run off on their own they bring back something..."

(Rude. Not Meep 😭)

(rudeness surprises you? we aren't exactly a merry band at this point of the story)

(Meep got an extra gold coin. He's very merry)

"Dhara, what do you see? Do you need assistance?"

I'm waiting to see if I can open the door (which I doubt I can).  In the mean time I'll try to convey what I see, though I don't know if you can hear me or not.

You can hear each other through the wall; the sound is just slightly distorted.

Dhara, the door is very heavy and you are about to give up, thinking it’s locked, when you manage to move it a bit. Pushing it open further you hear a metallic sound, but nothing happens.
When the door is fully open the first thing you see is a suit of embellished armour in the corner right next to the door.
You step into a cold, cluttered, 25x25ft room. It is dark and the air is heavy with dust. Opposite the door you came through is another stone door. Alongside the wall running between the two doors is the suit of armour followed by a row of cupboards, their viewing windows greyed with time. In line with the open door is a desk piled with books and parchment that look like they will turn into dust if you touch them. Further along, beyond the desk, are 5 glass columns filed with milky purple liquid - in which something is submerged. The submerged silhouettes appear to be circular, the size of a pumpkin, with some small tubes coming out of them. The columns are surrounded by a mass of things. From what you can make out there is more books and parchments, vials, a couple of cauldrons and there are some wooden planks – in the past they probably served as some sort of shelves, now fallen off the walls and rotting.

Meep, the tunnel is much like the previous once. You notice that you no longer hear the clicking of the kruthik. All you hear is the people you left behind chatting. Far at the end of your vision you can see the tunnel opens up into a bigger space once again.
(Meep, roll DEX save with disadvantage)

So, it looks like no one has been here for quite a long time, is that correct?  I'd like to search the room to see if there's anything of value (or coin), or any interesting information.  Particularly the suit of armor, and the glass columns (can I see what's in there?)

Investigation: 19

Also looking for traps of any sort .. 

Perception: 16

Yes, the room seems to have been abandoned for quite some time.

Dhara searches the room and after some time you have found 9 gold coins, a finely made decorative wooden box –size of a small book, and 3 books that are mostly intact (one you can’t read; one, ‘Across Rul’s Empire’, seems to be some sort of history book, with maps drawn in it, of this continent but nothing really makes sense to you; the third one, ‘Nature of The Weave and Plane Collapse’, seems to be a writing on the weave and plane travel.)
On closer inspection of the glass columns you can see that the things inside look like some sort of cyclops heads. Each has 1 to 3 tubes that are about as long as the height of the ‘head’ and end in a small circle, as well as 5 to 10 tubes that are much smaller and seem to end in a point.

After searching the room, you turn back to have a closer look at the suit of armour. As you turn back to it you notice it no longer stands in the corner, instead, it is moving out of the door and towards the rest of the party.

(no traps that you can see in the room, other than the moving armour...)

DST 8

DST 24

Meep, in his rush to keep going forward, does not pay attention to the floor he is stepping on. You step into a leg-hold trap and suffer 10 points of damage and it takes you a couple of minutes to get out of it.
(After you get out, you'll continue foreword?)

(Is the trap deactivated now that I cleverly set it off?)

(yes, and now you see a few more along the tunnel)

Meep screeches at the trap, more so for him falling in one that he'd seen in his own home tunnel before. The kobold would utter a few more choice words then continue ahead. 

Ok I'll move my hunter's mark to it (assuming it is still active .. 1 hour?  Since the first fight).

Assuming it is just walking and somewhat stupid, I'd like to give it a bit of distance and then run/dash around it to pop out of the wall in the same corner I came in before it get's out, yelling "Round 2 .. look alive!"

Initiative: 18

Meep, You reach the end of the tunnel and, having had learned your lesson, are paying more attention this time. Before you is an open space around 40 ft wide and 25 ft long, with two tunnels other than the one you are in entering into it. The tunnel opposite the one you are in ascends sharply. The other one enters the room at one of the corners and through it you see an armoured human male enter the space, swinging his sword at empty air.

Dhara rushes back through the illusion wall and back into everyone’s view. She is followed by a moving suit of embellished armour.

Everyone but Meep, roll initiative.

Meep would stare at the human for a bit

Halahce curses as he sees the armor, opnely glaring at the tiefling. "This is exactly what I meant. If I had known how bloody foolish this lot was I would have made my own way." He curses, his words getting harsher as he moves to back away.

Initiative: 13

Kamos: (to the party) "you may get your wish yet, if we keep encountering monsters like this."

Initiative: 12