@henchman - Do you remember Billy saying that there was an SOS signal at the Mul Cavern? Head back there and go find where the signal is (try the south entrance, take the left tunnel and head left). (I'm assuming you don't have the fourth quick equip item since they do explain how to use it if you talk to them, just point the beam at the mirror part when you complete the shard.)
Henchman29
I may just be an idiot, but how do you get past those obelisk things (for instance, in the well tunnel and the crater area)? They seem to be invincible to all my attacks, and I can't get past them without being absolutely pummeled. Am I missing some essential strategy? Because in the crater area, they seem to be completely blocking the way at one point.