Didn't the naga book say the torches have JUST been lit? I thought it was pretty clearly inferred to be the Oathstones, especially because they actually light up.
I think we have still yet to actually operate all of them, so we don't know what happens that would let the Void come in.
Considering how unimportant it has been yet, I have a feeling the warp mechanism on Tyrhold will be used somehow.