Since you already have introduced several types of items like Crystalline, Azure, Bronze, Bejewled etc i wanted to suggest something.
Dragons, there should be several types of dragons you could grind and they would all have different powers, bear with me
Azure Dragons = Glacia ventus, Ignis Glacia (frost powers)
Crimson Dragons = Flama ventus, Ignis flamma (fire powers)
Emerald Dragons = Poison breath, and maybe poison cloud? (bug spray powers )
the thing is, people r grinding dragons alot easier than b4, and for beta they should be high risk and live in Caves not dungeons, unless enslaved, which is when the dragon would be called "Troll/Adept/Wizard Enslaved Dragon"
The Azure Dragons could live in a Cave which had Blue Geocrystalls outside the cave and inside. The frozen cave
The Red Dragons could live in some kind of lava pit along side with fire imps. The Lava fields
The Emerald dragons could live in some area called Enchanted Woods
These would ofcourse be powerful beasts and should be somewhat away from areas where lowlevels would grind, maybe your first clearable spots?
to make these different dragons you would just Alter the Texture on dragons and how they behave with spells.
You could also introduce a questline where you would have to kill 10 of each dragon, also they should not be obviously and easily found by any player, they would have 2 look for it.