Going back 10+ years ago, I remember when the infernal forge was in the game. I remember when it was taken out, too. I believe back then it had the property of taking a very common mineral and randomly forging it into an item of a different material type.

And so players would form a party, loaded down with tons of cheap mcgrail, fight their way down there, set up transport runes to their castles and mines, and forge unlimited powerful weapons.

Until maybe Shadowraith learned about it. Then the entire world of Darkemud witnessed a terrific moving of the earth, and a volcano spewed ash, covering the world in darkness for two days. And when it was all over, the forge was no more...

(Essentially, it was crazily unbalanced and was taken out.)