Hopefully some of you will find the links useful :
HellFire Ninsages --- Another fan-based HellFire site.
Mobage's official Q&A --- Useful for beginners
If you've found any other useful links, you can share it in the comments section below.
Those are great links, very helpful. I did a quick search on Google and it looks like those are the only decent HellFire pages out there right now, apart from this wiki.
I found one more "hidden" hellfire FAQs in some forum :