From LSWiki

The demon lord Krythe maintains a dark sodality, from his bar, the Nine-Spoked Wheel.

Ralnos burps: Thish ish under conshtruction.

Joining

The joining phrase is "I desire to join the sodality of the nine-spoked wheel". You need to have one charisma and willpower specialty point free. Below is a log of what Krythe asks of you when you attempt to join.

    Demon Lord Krythe yawls, (Yeah friend, that'sh not shomething I talk about while shober, ya
    know?) at you.
    Demon Lord Krythe drawls, (the Nine-SHpoked Wheel ish immenshely powerful, buy me a drink I'll
    tell you all about it.) at you.

    You give a firebreather to Demon Lord Krythe with your right claw.
    Demon Lord Krythe drinks its firebreather.
    Demon Lord Krythe presents a green drinking glass for returning.
    Demon Lord Krythe returns a green drinking glass for one gold.
    Demon Lord Krythe mmms happily.
    Demon Lord Krythe blusters, (Yesh, that'sh the shtuff!  Welcome to my SHodality!)
    Demon Lord Krythe snickers at you.

    You whisper, [= I desire to join the sodality of the nine-spoked wheel =] in sibilant Anglic.

    Demon Lord Krythe drawls, (Did you expect it to be that eashy?  Get me a little drunk and have
     your way with me?!  How about you bring me the heart of a child.. no.. the head of a lamb.. No, I
     got it!  Bring me a fuzzy little black kitten with it'sh legsh pulled off while it shtill livesh! 
     Nah, forget it, too meshy, jusht find and kill that guardian chick, okay?  Come back when that'sh
     done.) at you.

Note that Lupines cannot join this association.

   Demon Lord Krythe drawls, (The worship of Gaia doesh not allow the veneration of Ashmodai, sho you cannot join the SHodality of the Nine-SHpoked Wheel.) at you.

To do this, you have to kill the guardian spirit located in the altar ('touch altar' syntax) in the room with an altar missing its south wall. After defeating this powerful being, return to the nine-spoked wheel to join.

Benefits

Increasing your Qlippotic Affinity and Willpower will give you specialty access to Supernal Durability. Additionally, the higher your Qlippotic Affinity gets, the more you will deal qlippotic damage to enemies that successfully strike you.

You will gain 1 point of Supernal Durability specialty access for each 75 points of Qlippotic Affinity that you have, as well as 1 additional point for each 150 points of Willpower that you have. Note that Supernal Durability requires 2 specialty points to use at all, which means anyone without 150+ willpower will need, at minimum, 3 specs (and most likely 4) in Qlippotic Affinity to get any SD access whatsoever. -- Marcosy

Escaping the Sodality

    You whisper, [= I want to break the wheel within myself =] in sibilant Anglic.
    Demon Lord Krythe laughs at you.
    Demon Lord Krythe blusters, (Fool!  You can't leave us that easily!)

However, he changes his tune if you have something that can threaten him, such as a certain ring.