A list of characters, including what stories they appear in, where they fit in the setting, and who they are connected to.
Timeline of events. Mostly the big ones, so I can remember what happened at what point in the timeline of the setting.
Supernatural add ons and major physical changes to the setting. For examples, adding phantom streetcars and what it means to the setting if I burn down Landmark Center.
Rules for magic. How it works, limitations, how it behaves, who uses it, etc
Rules for monsters. What they are, what they can and cannot due, how they fit in the setting, etc.
I am sure there are things I haven't even thought of yet.
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Timeline of events. Mostly the big ones, so I can remember what happened at what point in the timeline of the setting.
Supernatural add ons and major physical changes to the setting. For examples, adding phantom streetcars and what it means to the setting if I burn down Landmark Center.
Rules for magic. How it works, limitations, how it behaves, who uses it, etc
Rules for monsters. What they are, what they can and cannot due, how they fit in the setting, etc.
I am sure there are things I haven't even thought of yet.