I'm not sure that's a given. Where did you find that out? There are a few different explanations I've heard, such as "help files constitute what is common knowledge in Thera". Really though, I don't think there is any kind of concrete IC explanation for it. It's just an OOC thing that makes the game playable.

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If you read everything that they tell newbies when they go through the academy it says they're memories.
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Redcro

Happiness is like peeing yourself.
Everyone can see it but only you can feel the warmth.