User blog comment:Blanzer/Suggestions/@comment-4524434-20111102013414

i was playing the binding of isaac the other day, and i came up with some ideas for terraria while doin so: 1. An underworld castle where demon enemies and a new boss can be found. It could be made out of obsidian brick and hellstone brick and be filled with unique treasures and items.

2. In said castles, there could be merchant devils that you could make deals with. An example: You could get your total amount of mana raised past its limit, but you have to defeat a bunch of strong monsters or have the amount of mana subtracted from your life points. That, or you could get certain items that are hard to find under normal circumstances, but you would have to preform a quest of some sort or give up some of your heart containers

moar ideas to come!