I am also new here. I think you want to set the "Progress tracking" in the Kill block to Bar and not Counter? I don't know if they allow for Boss battles? I set the target to Elite and it kills me although I am well armed. Check into that Bar/Counter option. If you downloaded the user manual PDF, it is on page 59.
Hope that works!
No, I think you can only set them to elite. If you want to see how each archetype fights, I just made a fighting pit where you can watch them in a battle royale.
Here's the regular version, Battle Royale in the Nemean Lion Pit: https://assassinscreed.ubisoft.com/s...20de408cfc7046
They kill each other off pretty fast so I made one where they can't die called Eternal Battle in the Nemean Lion Pit, you can find it here: https://assassinscreed.ubisoft.com/s...1ede34d8976400
Hope this is useful or fun!