Categories are a combined resource of several pages on the same topic, it can range from as few as 1 page to as many as 10,000 pages (and possibly more).

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A collection of terms which can describe something in a shorthand term.
Formulas and game mechanics to better understand how the game works, or how a certain mechanic interacts with another.
Items (aka equipment) which the player character can equip to enhance him/herself.
NPCs are Non-Player Characters whom the player character can interact with, ranging from talking, accepting quests, or killing.
Quests are tasks which the player must fulfill in order to gain great rewards.

See Also

A software interface which players may use to create their own in-game extensions to enhance the UI in some way.
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