my suggestion or what i would like to see:
- easy accessible in game guide: as i stated often players don't even visit a forum having both (even copy pasted) would be cool in my opinion and i dont think it would be too hard to implement it. At the very least would be nice a clickable link to the forum as "quick and cheap" solution or adding some extra text in the tutorial that points in this direction
- a glossary i think is for sure needed with all abilities and their effect described in more detail unless you improve also your tooltips this will be a welcome change
- a guide about how the "math" works behind the scenes , players are always interested to know especially about spells failure rate formula.
- Basic strategy guide -> engaging and disengaging enemies for example
- Community guides, chosen by number of readers/popularity in the "normal" forum.
i can't t hink of anything else...the list is based on what i would prioritize.