"Add useful information"
This should be the mantra of all writers and editors here. It is your main purpose and guideline for what kinds of articles and information belong in this wiki. Add useful information. Err on the side of too much. If you want to add it, it's probably useful. Seriously, go to town.
That's not just the best asnewr. It's the bestest answer!
Useful how? Understanding and enjoying Erfworld!
Articles that help establish a frame of reference for the story can also be useful.
Articles about meta-facts, such as the creators, the fans, events related to Erfworld, the history of the project, press that the project has received, etc. are also useful and should be added.
What information isn't useful?
Misleading information isn't useful. Speculation that looks like fact needs to be clarified. Facts should be sourced when possible, but do not fall into the trap of classifying whole sources as off limits. Use common sense and reason. Challenge and research anything stated as fact which causes you to doubt it.
Spam isn't useful. Kill it with fire.
What about style?
A consistent style is useful. But enforcing a consistent style to the detriment of the usefulness of the tool is what has killed most of Wikipedia's awesome potential. So if you want to contribute your time cleaning up articles and making them clearer and more consistent, that is great! Please, please do, we need that! Just remember always that style is trumped by substance, and never hurt an article's utility in the name of improving its look and feel.
Some things you can do to improve an article:
Make it clearer to understand, because that's useful.
Improve its organization, because that's useful.
Clean out redundant information, because that's useful.
Correct the grammar, spelling and punctuation, because that's useful.
Track down sources of facts, especially facts you question. That's useful not for its own sake, but for the sake of having an article with true information in it! If the information you're looking at is unsourced, but you have no reason to doubt it, then don't worry about it. We do not need to see "There are five fingers on the human hand." That's not helping.
In short, editors here should not get hung up on points of style. Don't give the slightest consideration to the word "encyclopedic" or anything similar. This wiki is not meant to be pretty, academic, or encyclopedic. It's meant to be comprehensive, dynamic, constructive, and helpful. If we eventually do get bogged down by trivia, then organize the trivia. Do not delete it!