You can register your party and comments at the Phantom Tree on the 1st Floor. When the party you register participates in battles, the victory rate is updated. You may receive money depending on your results.
Starting with the 2nd floor, you can go to the Phantom Tree on each floor to battle against parties that were registered by other users.
Use "Revert from Chaos" to exchange your Chaotic Astrals for Astrals that were raised by other players. However, exchanges are done through a lottery drawing, so you may get Astrals that you don't want.
Keziah Mason is on the 1st floor.
She can purify Chaotic Astrals,
as well as help you get back to the surface.
You can purify Chaotic Astrals with Purify Chaos. In order to purify them, you need a large amount of money, or a special item called a Nyar Ball, which you can only get by defeating Nyarlathotep.
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