Well, you can play any way you like, but personally, if I'm trying for the Conqueror badge, I either make sure to pick up Berserker trait along the way, or be prepared for a drawn out, tedious dance with the AoD, because I can't count on getting a lucky Invulnerability any more than I can count on a lucky Hatred Skull, or Ballistic Vest, or even Phase Devices. UC is late enough in the game that it's easy to hit character level 10 before it, by which time you can have a Master trait plus three levels to get Berserker. That's a strategy I can count on. Hoping I get a lucky drop is not.