An unlockable Chapter can either be a role playing chapter, a short story with lore, or an information page, some can even give you an Achievment!

Here's the current list of Unlockable Chaoters:

1: Malefic Clown Idol's Bestiary
(You can get this by getting Malefic Clown Idol to show you her Bestiary.)

2:  Chaos Evolution
(You can get this by meeting or evolving a friendly Keter into a Chaos Class Keter)

3: Stagnant Air
(You can get this chapter by going to The Moon.)

4: Cursed Crown
(You can get this chapter by having anyone where the Cursed Crown of Hanging Voices.)

5: What it means to be a Keter
(You can get this if an Anti Keter in your party dies.)

6: ???
(Get this by asking for this chapter when you make a deal with Satan.)

7: Halo of the Garden
(Get this by finding the Garden, located withing The Terrible Fortress.)

8: Lord Help Us All (Flashback Chapter)
(Get this by having the whole party forced into a dream state by Malefic Thought Silencer.)

9: The Core
(Get this chapter by sacrificing one party member the The Core.)

This list will expand as the rp continues.