R3

''The Yapping noise you had heard is in full cacophony as you look about and see the room full of kobolds. They must have sensed you somehow as they seem fully prepared to attack you. Makeshift tables litter the area.''

4d4 Kobolds + 4 Kobold Sorcerers

Searching the Walls
Perception DC 25 +1/10': You see a small crevice in the wall here, it looks like something burrowed it, it's only large enough for a small creature to crouch in, or a medium creature to crawl through.

Searching the Tables
On top of the tables, scattered, are crude renderings of the outlaying forest and marked where the laborers were felling trees.

From K5
''Peeking your head from the tunnel, you look around and see large room. Ahead of you is a tunnel. To both of your sides is another.''

From T1.2
Ahead of you is a large room, there are two further tunnels ahead of you to your left and right.

From T3.1
''Ahead of you is a large room, there are two further tunnels from the room. One ahead of you and one to your far left.''

From T3.2
''Ahead of you is a large room, there are two further tunnels from the room. One ahead of you and one to your far right.''