"Destroy both demons and the drow nest in one go?! You can not do better than that! Unless you invite the mindflayers to the party but we don't have time to issue invitations." Yes, Sekkar knew some fancy words too. "Why do you believe one drow over the other and why do you care about the fate of murderous slavers, who despise, kill and enslave every sentient race in the tunnels? Just because you were not specifically their slave and don't know what it is? Then just ask! Any of us can tell how it felt. I can add on top of that my village, that a pack of those murderers wiped out because it was on the way. Listen, they might look like people, but inside they are spiders. I take a quaggoth over a slick drow any day. At least a quaggoth will openly try to kill you. The wizard says the city is locked or something. An ideal place to keep all spiders in the jar, not warring they can escape. Besides, who said the wizard would not try to scry on the thing? You will blow our chances for nothing if not go through with the plan. It's crazy enough as it is too complicated with side ideas." "I am for sticking with the plan."

"I was enslaved by the drow as well. I am not claiming that they are all good. But, if I've learned something while being down here its that you can't just paint an entire race with a single brush. Only a few months ago I wouldn't have hestitated to kill every Duergar I came across. My point is, not every drow in Menzoberranzan deserves to be slain outright. We're deciding the fate of thousands of beings. If even one of them is good, have we made the right decision? How many good people are we willing to kill, to destroy some bad?" 

Seeing that her short break to seek more time to study her book drew the attention of Vizeran she did her best to shift gears and study the map and learn the information provided on the city.  She felt a distaste in her mouth re the drow, but she felt the same as Pax. So much of her perspective of the underdark and it's inhabitants had changed that she was trying to keep an open mind.

"I'm open to finding another place to call the demons but at the same time we are talking about drawing demonslords so they can be killed and sent back to their own plane of existence.  There will be those who suffer by this decision that do not deserve it.  We should try to reduce that if we can. Do we know if there is a better place than another to place it?"

Besides this short conversation Kaylyn continues to commit the majority of her time to studying her book. She stays up late into the night forgoing sleep to study the book. 

"If there was one ever, that one long being sacrificed, fed to the spiders or - some very lucky and clever - escaped the place. Others are trading slaves there, backstabbing and killing each other, and participating in every bloody crazy ritual those spiders have. You are searching for a wolf that eats grass in the wolf den. There is none. See for yourself - one drow whispered you the words you like and already set you to betray another you trusted just a moment before. You do not go through with the plan, you risk losing the world, not even Underdark. If drow have to pay the price for us all - at least they were good for something."

(Instead of Scrying on Sarith, Rhayna will instead cast Divination and ask if the party should do as Vizeran instructed.)

Afterwards, when the "lesson" was over. Rhayna would go back to the library, and find a good spot to settle down. She takes the Stonespeaker Crystal, and she starts the ritual to cast Divination. "Is it wise to follow Vizeran's direction, and take the talisman to Menzoberranzan?"

Pax shakes her head as if dismissing a thought. "Um, Grin is not a drow. He's a demonic servant. Interesting that a demon seems more worried about the fate of the drow city than we do. This is giving me a headache."  She glances to the ceiling, trying to find the right thing to do in her soul. "I have more thinking on this, but Sekkar, for all that, I'm not convinced. Perhaps when we get eyes on Menzoberranzan ourselves, we may make up our own minds. Now....can we inventory all the demons we know about and what we'll need to beware of if it comes to fighting them?" 

Demons:  

Demorgorgon - don't know

Zuggtmoy - tries to control our reality with her spores.

Fraz-Urbluu - makes people believe in other realities.

Orcus - undead, lots of undead.

Yeenoghu - the gnoll one who just looks like he's a crazy murderer.

Uh, who else was there?

"He is what? Though, the previous one was a demon too. Fitting. Wait, you know that thing is a demon and honestly think it could give good advice you should follow?! How are you still alive?!" Sekkar was laughing more than arguing at that point, though. "I truly wish we could think for ourselves here but I know nothing about all your magic. The wizard said we have to bring this demon heart into the magic tower and place it on the special spot. Does it matter? I don't know. When demons come to life, it's good to have some army fighting them - like drow. They are spiders, but spiders that can truly bite, protect their nest and have their goddess on call. Would it matter if they are there? I don't know. Can think of only one other place where demons will be locked enough and have someone to fight them - that labyrinth with the crazy machines and dead angels. There was some other demon too... whatshisname? With a team. Need to ask Rhayna, she kept writing all this stuff in her book and remembers."

Rhayna receives the following response:

"Evil's only goal is to serve itself. But when evil destroys evil for evil's gain, does not this also serve the good?"

The message ends, but instantly another comes through, in the same voice but slightly more urgent:

"If the Fox must have the chickens, don't give him the eggs also!"

Assuming Rhayna shares this information, Pax nods in understanding. Mentally to the others, "The wizard badly wants the book from the tower. We have no reason to seek it for him. Whatever he wants it for is unlikely to be good. Perhaps we should still get it ourselves, but it's certainly not our goal."  

Out loud she says, "OK, so our plan is to get teleported near to Narbondellyn, then, disguised with a Seeming spell, and made to look like Drow from house Fey-Branche, we will make our way through the city. Impersonating a Drow comes with a death sentence...well...given being us in Menzoberranzan comes with a death sentence, I'm not sure one more death sentence will make a difference. We then make our way to The Great Stair of Tier Breche, and as drow are hopefully let to go to the tower of sorcery. I'm unsure if anyone has any inflitration ideas past that point." 

She tries to get Vizeran's attention to ask some questions, "Getting up these stairs, or into the tower. Are there guards full time? Will they question why we are there? What are some reasonable reasons for house Fey-Branch representative to be going into the library?"

Rhayna is slightly confused with the message, which sounds very different from what she is used to, but she relays the information to the group nonetheless. "I would love to take a look at this book that Vizeran is after." After Pax goes over her plans, she will go back to the library, and will try to scry on Sarith. She hopes that he will be there, and perhaps he can aid them.

Vizeran seems impatient at the delay, and reluctantly hears Pax's questions, but then considers thoughtfully for a moment before replying:

Certainly there are warriors guarding the entrance to Tier Breche, but... if thou appear as drow then they should not accost thee. I suppose it is possible they may have some means of detecting magical disguise, but I am not aware of it. It has been many years, and I myself never encountered any opposition. The tower of Sorcere is not guarded, but is almost certainly heavily warded. Thou must be cautious.

Drow of all houses may enter Tier Breche. Priestesses frequent the cathedral of Arach-Tinilith, mages study at Sorcere, and warriors train at the academy of Melee-Magthere. Thou will attract the least attention in Tier Breche if thy disguises represent any of these. Go not as commoners or merchants.

Remember also that House Fey-Branche are sworn enemies of House Melarn and House Vandree. Avoid interaction with drow of those houses if possible. And if not, then remember that Fey-Branche are of a higher social caste, and are allied with the more powerful House Baenre.

Vizeran gives some guidance on the clues that indicate which Houses the drow belong to, including manner of dress, insignias, and so forth.

===============================

EDIT:

Rhayna attempts to scry on Sarith, but the spell fails. If what Vizeran said is true, and is it impossible to scry on people within Menzoberranzan, then it must be assumed that Sarith is there somewhere.

Pax seems to get some small amount of joy from Vizeran's impatience and talks extra slow, asking extra detailed questions about the drow families, insignia and so on. She takes a lot of notes and repeats them back to him to make sure she has it right, asking for pictures or drawings from any books he may have on the topics.  She will then cast a couple Seeming spells on the group, trying to craft illusions that will hold up to inspection, trying to mirror their gear but just adjust it so it doesn't arouse suspicion. She has Vizeran examine the details and give her feedback on how to ensure it's realistic, and makes sure he gives them pointers on how to act. 

Being fluent in both Elven and Undercommon, Pax makes sure she tweaks her accent according to Vizeran's feedback.  She'll put a decorative symbol on each of the other party members disguises so they can recognize each other amongst the drow. 

This all done, she waits for one more long rest so she has her full capabilities ready.  If the rest of the group is feeling ready as well, she casts the seeming spell across the party, paying careful attention to all of Vizeran's feedback, and then is ready for the wizard to teleport them to the region outside the city. 

To avoid suspicion, she does not raise her shadowy wards around herself. Leaving herself feeling rather naked and unprotected she prepares to do her best job acting as a member of Fey-Branche. 

(Anything else before leaving the tower? Kaylyn has had ample time to read the book, and can claim the benefits.)

Sekkar did not participate in accent training (keeping in mind what he heard but mostly counting on being silent like a good drow man), however, maps and general orientation in the city were not only needed but interesting. You never know when such knowledge can come in handy and Sekkar did his best to memorize the city's layout. Once done, he was ready to teleport.

(Rhayna was going to do some more scrying, but after her experience with the “Goddess”, she will keep it to herself in the Library. She does tell the group that they might encounter Sarith, though she wouldn’t know where in the city. She’s ready to go whenever everyone is ready.)

Kaylyn has spent much of her time in the library study the Leadership Secrets of Attila the Hun.  She is so relived to be finished and the knowledge fills her.  She then spends as much time with Sekkar as she can studying the maps of Menzoberrenzan.  In an discussions they may have about  Vizeran's ulterior motives she offers this when speaking privately to the others. “Do not underestimate the power of an enemy, no matter how great or small, to rise against you another day.” (Attila the Hun)

"Vizeran seeks vengeance against the city for exiling him.  How we avoid that I do not know.  If the opportunity arises perhaps we can take it but at this point we stick to the plan.  My concern is this.  Grin is trying to get us to not follow Vizeran's plan strictly.  He may try to betray us in some way to keep us from placing the talisman in the city.  We must be careful.  For if we do not follow Vizeran's plan we will make an enemy of Vizeran and the same words apply." She pauses for a moment.  "But it originally seemed that Gromph Baenre's grimoire was needed for the spell and now it appears Vizeran only wants us to save the book from its likely destruction when the demons appear in the city and the book is not needed if he can activated the talisman remotely.  I may be wrong here, but if I am not, perhaps we should seriously consider leaving the book alone, passing by the city and finding another place to deal with the demons.  Although Sekkar does make a good point, within the city the drow will rise up to battle the demons as well.  Too many layers of deceit and trouble to find the right path here."

Several days in the tower of an evil drow wizard is several too many, and everyone is ready to depart as soon as practical. Uncertainty and disagreement persists with the group, but with no better options being presented, they proceed with the default plan, knowing they can improvise or alter things as they go. Vizeran approves of the disguises, and offers a few more helpful pieces of insight:

Infiltrating Gromph's sanctum will be the most difficult. He is the most powerful mage in Menzoberranzan, and very cunning. But none know him as well as I, his oldest rival. He was ever partial to passwords, and whatever traps or protections he may have laid, it is certain he will have a specific word to control or deactivate them.

Unwilling to risk Kaylyn's teleportation magic, Vizeran gathers the group and casts his own spell. Instantly (and will remarkably less discomfort than any of Kaylyn's attempts) the group find themselves in a small, cold fungal grove. A small grotto leads to a ledge which overlooks a large tunnel, along which a dozen drow are visible, moving along it in both directions (two are riding giant lizards).

Here I must leave thee, Vizeran announces. Any further I cannot go. Thou knows what thou must do. Place the talisman and find the grimoire. Do not fail!

And with those final words he departs.

(Is there a patch where Rhayna can use Fungal Stride?)

"We'll be in contact Vizeran," states Pax as she looks about the group.

The group at this point has all been disguised as Drow using Seeming. They appear to be members of the Fey-Branche, with an additional decorative pin on your chest that looks a bit like the maze engine we ran into....so that you can recognize each other. As drow, we generally look similiar to yourselves, just a drow version, with matching heights. Your equipment is also similar to your equipment, but made to look a bit more drow styled.  The biggest change is probably Sekkar's snout which could invisibly bang into things since it's bigger than it appears to be. 

Pax, unusually 'visible' without her cloud of darkness surrounding her, has her tentacle rod hanging from her hip. "Well, let's get to it then. Sekkar, can you lead us to the gates and through the city please?" She prepares to follow the lizard, practicing her aloof manner.

(It can not possibly be a "matching rights" specifically for Sekkar and Pax - drow are not tall, and males a shorter than females, btw. Even with an allowed foot shorter, they have to stand out. And as much as Sekkar appreciates Pax's care about his snout, with an invisible foot of height, it would be the last problem for both of them.)

"Sure thing. Though you and other females should lead if know anything about drow custom. I'll tell you where to turn from behind." He did, poking the woman in the back to steer her in the right direction every time she tried to stumble somewhere else. Other than that, he was trying not to attract too much attention and let women handle talking and presentation of the group to anyone interested.