Slipping the books under his robes, Ozus points at one of the cultists. "You. Come with me, and bring one of those ghouls. I want to check on something in the bell room. The rest of you, remain here, and continue your work."

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ambush time y'all

Khessa comes back and warns the others  getting ready to strike. 

Tristan:

Keeping KJ back in the original hallway to protect their rescued prisoners, Tristan draws his sword and prepares for the ambush.

The cultist dips her head, and yells at the ghoul to come. It drops the books it was holding and follows Ozus.

(Everyone gets a surprise round, you may post your actions after Ozus leads them into the room)

Ozus leads the pair down the hallway, gesturing for them to lead the way down the steps.

Before the fight, Khessa protects herself with a Blade Ward.

As soon as Ozus brings in the 'guests', the blonde arcane warrior attacks the Cultist, welcoming him with a first diagonal descending slash of her [item]Greatsword[/spell], aimed at the calvicle, immediately doubled by a horizontal slash at waist height.

Khessa's Multiattack with Greatsword:

Attack 1: 17 Damage: 13 (slashing) or 4 if missed (thanls to Graze property)
Attack 2: 27 Damage: 10 (slashing) or 4 if missed (thanls to Graze property)

Tristan:

Tristan moves to engage the ghoul, his shining blade emitting radiant energy to counter the undead’s necrotic form!

Crystal Longsword (slashing and radiant):  Attack: 9 Damage: 10

Crystal Longsword (slashing and radiant):  Attack: 1 Damage: 13

(Sap effect on successful hit—disadvantage on next attack roll)

So, those attack rolls make no sense.  Try again:

Attack: 21 Damage: 16

Attack: 26 Damage: 13

(not sure what happened in the previous post, but 1d20+8 should not give a total of 1)

Naero 

"I'll stay here and watch over the others, just in case they coming running at the sound of battle" Naero whispers in Ozus' ear. As Ozus exits through the doorway of the room spid-ero climbs off his ride and up the door frame. He waits here watching the remaining goons.

Should look familiar . . ..

Use Steady Aim

Basic Attack (Advantage from Steady Aim) with Moon-Touched Shortsword: 26  Piercing Damage: 10  Sneak Damage: 8

Second Attack with Moon-Touched Shortsword: 16  Second Attack roll in case of Advantage (Previous hit grants Advantage) 10  Piercing Damage: 5  Sneak Damage in case of Advantage: 8

Savage Attack reroll of Base Damage on first hit w/primary weapon: 6

Off-Hand Attack with Dagger of Venom: 24  Second Attack roll in case of Advantage (Previous hit grants Advantage) 16  Piercing Damage: 3  Sneak Damage in case of Advantage: 11

Attack 1 probably missed.

Attack 2 is a Crit, so doubling the die on the 9 damage would be 14 damage, up to 22 with an active companion in melee range of my target.  Up to 30 if you want to also double the Sneak Dice!

Off-Hand probably hit with the 20, for up to 15 with an active companion in melee range of my target.

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As the targets came around the corner, Larry quickly thrust his blades at the forms, roughly gut-high.  His sword sunk deep once, deep enough that it sliced the hole wider than the simple thrust would normally make, leaving a gaping hole behind as he withdrew it again.  The dagger also found purchase, but nearly as devastatingly.

"Addpyl p'fwzvuy." Ozus chuckles darkly as his comrades attacked, the Infernal mantra triggering a series of attacks. A blade of swirling darkness is suddenly in the tieflings hand, as a dagger flashes from under his disguise.

Unfortunately distracted by his somewhat dramatic 'entrance', only one attack hits, the other two going wide. Ozus' Pact weapon draws no blood, but instead leaves a gash of necrotic flesh on the ghoul's back

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BA:  Conjure Pact Weapon 

A: Attack 1 Pact weapon: 26 to hit, 10 Necrotic damage (rerolled with Savage Attacker)

     Attack 2 Pact weapon: 11 to hit, 9 Necrotic damage

     Extra Dagger attack (Nick) : 11 to hit, 3 Piercing damage

The cultist and ghoul don't even have a chance to react before they're laying in a pool of blood on the floor. No other movement from the library area...it appears they're focused on their task and didn't hear the attack.

"Good job Ozus!" Khessa pats the 'tooth' on the shoulder "What do you say? If you go back in there in a moment, apparently frustrated, and complain that 'that couple of idiots from before made a mess', demanding that another similar couple follow you... might that work?"

"I'll move the bodies from the threshold in the meantime..." the tall adventuress lifts and unceremoniously throws the two corpses aside "...and clean up the bloodstains!" and with a few castings of Prestidigitation the blood that had stained the floor disappears without a trace.

"So, the second couple shouldn't fare any better than the first," the blonde arcane warrior smiles, confidently "right?"

"Kinda just depends on how gullible they are... but if it fails a suppose we can handle them regardless. Lets put on a show!"

Ozus is going to give it about ten minutes, then returns to the book room in a huff, muttering about "Messy, incompetent, useless-"

He snaps at the two remaining cultists. "You two! That idiot cut himself, and the blood put the ghoul in a frenzy. He is no great loss, I consider it a culling of the weak. But I left quite the mess putting the monster down. Go clean it. I'll remain here with the ghoul, and continue our work."

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I'm guessing a deception check?

(Yes, with advantage though.)

(Thats a 17 w/ adv.)

Naero 

When Ozus enters the room again, Naero assumes things went his way with the other cultists. Seeing Ozus continue the ruse he climbs up the wall and across the ceiling, ending up directly over one of the disciples. If things don't follow Ozus' plan, spid-ero is poised ready to drop into action.

The cultists, used to being snapped at, don't even question "the Teeth". They snap to attention and hurry out the door, and down the stairs, into the party's awaiting actions: