I have one really great suggestion.
GET RID OF THE FORGE.
I hate the Forge. I hate everything about the Forge. The Forge makes levelling gear up ten times more of a pain than it ever was. I've got a bunch of every fire crystal but Radiant Fire Crystals are hard to come by, even at the bottom of tier 3. The heat bonuses aren't worth it. The prize boxes (which I've gotten zero of) aren't worth it.
The Forge must die. I really, really hate the Forge. For the love of Nick, get rid of it. Please.
And what would you replace the forge with? Mist energy? Would we limit the playtime of players and revert back to when the game required someone somewhere to make a real-money purchase for anyone to advance past tier 1?
The forge is fine. The drop rates of radiant fire crystals needs to be bumped down so that the current D25 is D24, and shining fire crystals should stop dropping at depths 27 and lower.
Seriously. The forge is a great addition, however it relies heavily on the elite difficulty for loot, and constantly replaying. If rarities were made more, well, static across difficulties, and the radiant change I posed above was implemented, then the forge would be in good standing.
When the update was first dropped, the forge was great. 4* fire crystals were a problem, but not near-impossible like radiants are now-a-days. People were just too lazy to stop farming vanaduke to go get shinings, and here we are now with the current issue.