I don't think I'm doing anything wrong. I've completed these missions about 4 times on grandmaster and once on expert and I am not getting any of the catalyst or Intrinsic traits to drop. I've gone to Mars several times to check and nothing. Am I doing something wrong or is the mission bugged? Do I need to have Vexcalibur equipped during the mission? Also I found that you get way more great running this on expert versus grandmaster.