Magic cloud?  Drow farts?  Or spider webs?  Me thinks a little bit of everything!

Shall we proceed on into the room, Zhi?

Neph takes the book about the Spider Queen, rips out a few pages in the middle, and lowers his pants for a second.  "Ah man, my ass is itchy.  This should help."  He rubs the pages on his ass, making sure he's nice and clean, folds it back up in the book and puts it back on the nightstand.  He smiles and gives a thumbs up sign to Daewen.  After he gets his pants fixed back correctly, Neph presses on, ready to sneak into the next room.  

"Well, that's in my brain, now." Kasha mutters, wishing she didn't just witness what Daewen and Neph were doing.

A frown curls over the ophidian expression of Zhisshikassa. He opens his real eyes once the spell is complete and casts a serious glance around. "The light in the next room is magically dark. I suppose some of you may work well in the darkness, though even then - magic of that variety often prevents natural methods of seeing through the dark.

If we wait an hour, I may summon a creature which can sense even through that. If we are not waiting for that long, I suggest we tread carefully." 

I'm not sure we can wait that long here...something is afoot, and it smells like deceit.  Where is everyone?  Are they in hiding, waiting to spring a trap on us?

(Mobile) 

"Okay everyone," Doc shared telepathically with the Squad, "I am only one who has a chance to see through that darkness.  So I will go ahead first.  But, I want want a rope ties around me and Mock on the other end.  If something tries to grab me, Mock and everyone else can try and pull me out... hopefully in one piece..."  

Assuming everyone agrees with the plan, Doc will move attach himself to a short rope as discussed,  hand it to Mock, and then after taking a deep breath, open the door to the pitch black room...

• Stealth: 18
• Perception: 24 (Nat 20!!)

Antsy, Daewen stacks up right behind Doc and enters the room second.

Perception: 24

Audible Stealth: 17

18, 10, 22, 11, 7, 21

6 creatures that look like Drow with the half bodies of a spider creep out of the darkness after one of them spots both of you.

One of them asks in Drow, to Doc, "What are you two doing in there? That is not your room. Identify yourselves."

(Mobile)

Doc tugged lightly on the rope around him (hoping to give the others a heads up) before straightening up and replying loudly in Perfect Undercommon, "Intruders in the building!  I was sent to fetch you and lead you to where they were last spotted.  Come quickly!"  Before giving the creatures a chance to respond, Doc would turn around and quickly head towards the exit where he hoped the Squad was ready to surprise and strike the monsters.

Deception roll (for all the marbles): 28!!! 

8, 13, 9, 12, 19, 9

One of them hesitates, and says, "Hm. Really. I did not hear any alarm. What department are you from?" 

(Mobile)

"We're new recruits in the Security division.  We must hurry.  There are many..."  

• Deception: 28 (again!!!)

Neph sticks up against the wall and gets ready to sneak attack if any Drow comes through the door into the room, waiting on Daewen and Doc.

Good enough. The driders follow. What do you want them to do.

Quote from CrispyDM >>

Good enough. The driders follow. What do you want them to do.

I want them to... die?  As soon as a couple of them have made their way through the door, Doc will yell "Now!!!" And dive out if the way, letting the party surprise Attack hopefully take a couple of them out before they can even react.

Action: Dodge (because they're probably all coming for him)

Docinitiative: 19 

Daewen is pissed off with Drider3 (the one who spotted them to begin with), so she jumps out of the shadows and decimates it-

• Elven Accuracy/Rogue Assassinate Shortsword Attack #1: 27 Damage: 10
• Elven Accuracy/Rogue Assassinate Shortsword Attack #2: 23 Damage: 10
• Dread Ambusher Shortsword Attack #3: 26 Damage: 20
• Sneak Attack Damage: 10

Bonus Action: Cunning Action to Hide back in the shadows, becoming invisible

Initiative: 16

Seeing the creatures scuttle from the entryway Doc leads them through, Zhi immediately winds his hands in a quick incantation, drawing a dab of molasses over one clawed hand before extending a projection of magical energy outwards.

Zhi casts slow on any six creatures in a 40’ cube. DC 19 Wisdom saving throw or have halved movement speed (no running to call other guards!), -2 to AC and Dexterity saves, can’t use reactions, can take only an Action or a Bonus Action on their turns, and can only make one attack per action regardless of multiattack or extra attack. 

Zhinitiative! 4

Doc19, Daewen8, Zhi4

Here's the save for two: DC19 WIS save: 11, 21

Drider1: 17
Drider2: 5
Drider3: 13
Drider4: 15
Drider5: 19
Drider6: 6

Editing..

Where's the stealth check to rehide?

Doc19, Drider5(19)(AC19/HP123), Drider1(17)(AC19/HP123), Drider4(15)(AC19/HP123), Drider3(13)(AC19/HP81), Daewen8, Drider6(6)(AC19/HP123), Drider2(5)(AC19/HP123)SLOWED, Zhi4

Nephitiative:  16 

Neph appears from the side opposite Daewen and attacks the same one as they come through the door.  

Short sword 1 : Attack: 24 Damage: 8 

Short sword 2 : Attack: 15 Damage: 7 

Sneak attack :  23 

Daewen's stealth check: 26