I have no links to provide, I have no history in the community, I also don't even have the game or any mods (I did many years ago). With that said, here's my idea for a quest that myself and others can expand upon.
Preliminary information: This quest will be slightly different for a Khajit than any other race. See my note at the end.
Like in Morrowind, some Khajit are extremely xenophobic. There exists a small cult, (think of it as a self-contained assassin's guild) who worship a to-be-determined Khajit God (my Lore is not spot on, as you can see
. They have a radical interpretation of this God's will and seek to keep the lands of Elsweyr pure and free of non-Khajit (we can make a word for this) taint. The cult is entirely secret but they have regular meetings. Where? No one can seem to figure that out; well, no outlanders, until it's too late.
The quest will begin while the PC is adventuring more deep inside Elsweyr (the cult does not target only superficial visitors, but rather those who seem to want to stay a while).
After a failed assassination attempt on the PC, the PC gains a quest where they can investigate this mysterious cult. As you can imagine, this proves difficult, because the locals fear retribution and would not risk their life for an outlander. After some poking around and strategic glad-handing, the PC receives a cryptic note. It reads, "I highly recommend reading The Dance of the Two Moons. My favorite passage is on page 4." Weird right? Well, if the player finds that book (which I will write), and goes to page four, there will be a poetic passage referring to a certain location. If the player ventures there and explores a bit, they'll find nothing obvious. That's just it. The meeting place of the cult will be in the trees, far up, and will require climbing (which the Khajit will obviously prefer.) But it's not that simple. The meetings only take place at certain times (also referred to in the book). When the two moons dance (this is well known Elsweyrian lore) is when the cult meets in the trees.
Note: For Khajit's the quest will be gotten by interacting with a non-Khajit NPC who survives an assassination attempt and asks for the PC's help in understanding it.
This is all I got so far. What do you think?