D
It looks like you're in the Final Castle in the Twilight Forest. I'm not sure if it's fully implemented yet.
You'll notice that some of the forcefield panels have doors, like the one in that central yellow-green forcefield on the right. Wander around the rooms, marking the ones you've explored in one way or another; if you don't find anything interesting after searching the castle top to bottom, it most likely means there's nothing to find.
Also, just FYI, this is not the section of the forum most appropriate for questions about modded Minecraft (or Vanilla, for that matter). If you post in the General FTB Chat section or in the "Ask a Simple Question, Get a Simple Answer" thread in that section, your post will be seen by a lot more people with a lot more up-to-date knowledge about the mods in question than most of the people here.
You'll notice that some of the forcefield panels have doors, like the one in that central yellow-green forcefield on the right. Wander around the rooms, marking the ones you've explored in one way or another; if you don't find anything interesting after searching the castle top to bottom, it most likely means there's nothing to find.
Also, just FYI, this is not the section of the forum most appropriate for questions about modded Minecraft (or Vanilla, for that matter). If you post in the General FTB Chat section or in the "Ask a Simple Question, Get a Simple Answer" thread in that section, your post will be seen by a lot more people with a lot more up-to-date knowledge about the mods in question than most of the people here.