There's a reason I put all that DS energy there.
That's the first room you enter, and it will contain quite a few Force ghosts.
The energy is there, as they would supposedly "draw" their power from it to sustain themselves. (Maybe I think these things through too much...

)
And the more ghosts there are, the more energy needed, right?
@Topic:
Here's V1 of Ninden Vork's sword:
