Hi there. This also makes an alternative ending. Sorry, I made a new topic for that. (I did not see this here first, just erased it) I just found it out when I was bored about 10 years ago. It is because Giedi Primus is a dead planet without vegetation. The Harkonnens fear vegetation. I am laughing when people call them warmachines without mercy. They are a bunch of wimps. So they evade the planet because of their fear. Yes, it is true, that there is no more spice where the vegetation is, but the wimps don't run because of that. Everybody should try this alternative ending.
