A Strange Cult - NWN Side Quest (Chapter 1)
A Strange Cult is a parallel side quest that starts by speaking with Jemanie inside of his Barricaded Home in the western portion of the Beggar's Nest. If you need help finding Jemanie I recommend you take a look at my Find Jemanie quest page as that'll give you a map location and all the details you need to locate him.
What I mean by this being a parallel side quest is that it will be completed with you finish the main quest of the area, Beggar's Nest: Undead Infestation. For this quest you are tasked with infiltrating the cult building to the north of Jemanie's home and learning about what takes place inside. A screenshot of the front entrance to the Cult Estate is shown below.
This is the only part of the quest that is "unique" and will offer you an EXP reward that you can't get otherwise. When you approach the door and try to enter you'll be asked to show proof that you belong to the cult, Jemanie gives you the stone needed to enter if you ask him about it.
Front entrance to the Snake Cult Estate in Beggar's Nest
After you enter the Cult Estate this quest pretty much is tied in entirely with Beggar's Nest: Undead Infestation. The Yuan-Ti who is the leader of the cult is also the main boss you need to eliminate for the Beggar's Nest: Undead Infestation quest. When you defeat her both of these quests will solve at the same time.
Much like other parallel quests this will complete when you finish the main quest and be moved to your Completed Quests tab of the Journal. If you return to Jemanie after completing it he'll offer you no reward what-so-ever. I'm not entirely sure what the purpose of this quest is aside from messy coding done by Bioware. Maybe they had intended for this quest to be something more than it is and they eventually scrapped the idea... Or... Whatever the story is behind it I am legitimately curious.