(ok, then roll Athletics check for it. And you can add the 1d4 from guidance)

Athletics: 18

Guidance: 2

Kamos, you manage to pull Jaylen away from the threads, and with a loud snap the thicker thread snaps. The force makes the rest of the threads around you vibrate for a moment. The area where Jaylen was trapped, of 15ft, is now cleared of the threads.

From where you are, the tunnel only continues for another 30ft, where it, and the sticky threads, spill into another cavern.

Halahce will make his way around the threads, ready to burn through them with a Firebolt. "I do not wish to see the spiders that made these webs...."

"No that would be frightening indeed! But studying the fresh corpse of one could prove quite enlightening."

Reaching the end of the tunnel you step into a cavern, which is about 50ft in diameter. All sound, even the sound of your steps and breathing, are suffocated by the thick lining of the sticky threads on the walls and ceiling. The threads line the floor as well, but the spacing between is sufficient for you to slowly make your way across.
There are some stalactites and stalagmites that stand out sharply, due the lack of threads on their surfaces. Throughout the room there are also multiple cocoons of different shapes. Most are perfect spheres of 5ft diameter, while others are of irregular shapes of different sizes.
The wide tunnel, covered in threads, seems to continue from the other side of the cavern. However, there is another, somewhat smaller tunnel leading out of the cavern. A thick lining made of threads hangs loosely around its edges, as if it was recently cut apart. Slowly your eyes are drawn towards the side of the small tunnel, where an irregularly shaped cocoon appears to be shifting slightly.

Kamos: (to the party) "Do you think people are in those things?" Kamos says indicating to the "cocoons".

Dhara will approach the moving cocoon and attempt to slice it open with her dagger.

Dhara, as you start walking towards the cocoon, a clump of sticky threads flies towards you from the ceiling.

Sticky threads: 20

(Everyone, roll initiative)

Dhara, you are now restrained by the webbing.

On the ceiling, from where the clump of threads flew, you can see a large spider clinging to the threads that surround it. Its attention now clearly focused on Dhara.

Hallhace curses in orcish and readies himself for a fight.

12

Initiative: 17

Jaylen: Initiative 5

When Jaylen's turn comes he casts Shillalegh as a bonus action and with his action casts Thorn Whip at the spider on the ceiling, pulling it to the ground if he hits.

Thorn Whip: 15 to hit, 5 damage (plus any damage the fall may do)

Initiatives;
Dhara: 10
Meep: 17
Spider: 15

Initiative order:
Meep
Kamos
Spider
Halhace
Dhara
Jaylen

Meep who has been sticking close to Dhara, takes his rapier and tries to cut the webbing.
Attack: 25 Damage: 13

Meep manages to cut the threads. (Dhara is no longer restrained)

(Everyone, post your actions for the first round.)

I'll Hunter's Mark the spider, then I'll back up as far as I can and fire an arrow at it.  If it closes to melee with me first, then I will disengage and run back instead of attacking.

Longbow Attack: 22 Damage: 11, Hunter's Mark: 4

Halhace will attempt to blast the spider with a Firebolt.

Attack: 20 Damage: 4

Kamos seeing the spiders are on the ceiling will go into a defensive stance waiting for them to get within melee range.

Movement: no movement this turn.

Action: Dodge (When you take the Dodge action, you focus entirely on avoiding attacks. Until the start of your next turn, any attack roll made against you has disadvantage if you can see the attacker, and you make Dexterity saving throws with advantage. You lose this benefit if you are incapacitated or if your speed drops to 0.)

Bonus Action: no bonus action this turn.

The spider moves to stand on the wall, 30ft away from everyone, and it once again shoots a clump of web at Dhara.
Attack:18