Or, if you prefer to be Master of Flames, check this guide: http://www.arcgames.com/en/forums/neverwinter/#/discussion/1202467/master-of-flame-renegade-guide-burn-with-me/p1
My guild is going to build GH L3 today and we've got enough Stone from vouchers to manage upgrading it to L4, so - it's possible. The most difficult thing is getting Influence. That's why I've been farming it on alts. :P
It's such an honour to play with such an experienced CW player. Benio is a helpful wizard for party. This probably is the best MoF build on the forums, although you need to be skilled CW to properly use its potential.
If the logs (file ERRORS.log) contains lines like: 1. Turn off launcher. 2. Turn on Task Manager. 3. Go to "Processes". 4. Find process "crypticError.exe.deleteme" and kill it. 5. Delete "crypticError.exe.deleteme" file from your Neverwinter directory. 6. Turn on Neverwinter.
For me, Ring of Piercing would put my ArPen over 65% so that's not worth it. I'd better take Ring of Recovery. But it's my personal opinion and everyone needs to check their stats - that's all that matters.