1 - The missing villagers of Tar

Tianni's sword goes down as the spiderling jumps at her, missing it by a split second. Seizing the opportunity, the creature try to knock you prone for its incoming allies.

The unknown creature in the light reveals itself to be another spider-kobold as it enter the cave, gets on all four and points it abdomen at Mee'haïl as it shoots some kind of webby blob. Alert to the incoming attack, Mee'haïl cuts through the web that comes at him and gets ready for the incoming enemies.
The two spiderlings coming from the enlightened tunnel follow the shot and dash straight to Mee'haïl, attempting to take advantage from their number to chew his limbs.

Mee'haïl, your blade cleaves straight thought the spiderling and hits the second one that didn't expect it to reach him. Visibly afraid, he carefully step back dodging your assaults.
He jumps again and tries to run away as he gets fried by a sudden bolt of fire.

The strange spider-kobold, aware that he stand no chance as you literally destroyed his allies without a scratch, starts to run away. The spiderling currently fighting Tianni has nowhere to run to and keeps fighting for his life.

Attack rolls on the fleeing creature are made at disadvantage, or here comes the second rolls for each of your attacks.

Mee'haïl's javelin flies at the fleeing creature and hits her as she turns back, surprised by the hurtful words she just heard. The attack reminds her the immediate that that is coming for her if she sticks around, and she disappears in the light coming from the outside.

Silent immediately comes back in the cave, and you only hear the death rattles of your arachnoid enemies along with the heavy breathing of your companions.
A small oil lamp on the north wall provides some light in the room, just enough to let you see the shape of your surrounding. The ground is surprisingly dry in here, especially compared to the green cave where you were standing only minutes ago. On the ground the remains of a cart rail goes east, west and south, which matches the opening that would allow you to get in and out of this room. You see two small and very dark tunnels on both sides of the southern opening that don't seem to go anywhere.
Some of you seem to need to take a break and take care of their wounds. Those of you who killed spiderlings have some kind of yellow goo on their weapons that is quickly turning brownish.

What do you do?

Tianni, there's nothing that would look like a cloth in your immediate surroundings apart from what your party brought. When you put the goo on the little flame, it doesn't catch fire but emits a lot of very foul smelling smoke very similar to the one you smelled when Sedror burned your crawling pursuers minutes ago.

Mee'haïl, you easily retrieve your javelin in what you now recognize as the entrance of the mine. Spider-goo stains on the ground confirm that the creature fled outside. As you come back to ask your companions for rest, you see Bug carefully climbing down the opening to join you.