@DarkHawk
No, the switches are there to open the knights tomb. I have found the Star Stone there, but I'm still looking for Garricks Blood Stone. I think I have to go down the vent, but how do I do that?
He was dropped down the vent and you can find him in the room below with the star stone. There are no other safe ways into the dungeon and no other blood stones to be had there, because it was orks who stole blood stones from the warehouse, then made it look like it was Garrick job and then dumped him into the vent.
