In terms of magic - or any type of 'rule' around here it's very thread specific (except in the Persistent World in which there are a global set of rules).

If you join a thread with a magical element and are curious about it then ask the author - they can give you the information you desire. The articles are just individuals opinions, we have no set ground rules for much of anything. If I was to pick a set of rules they would be something like:

1. Be open-minded and courteous
2. Be respectful of others opinions
3. Have fun

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