Don't forget, as mentioned in the big bold text at the start of this thread: This thread contains unmarked spoilers regarding the Wildlands storyline. In other words, you don't need to mark spoiler tags on anything related to the Wildlands storyline.

Caius was a butt of a boss, easily the hardest of those in the main storylines. I had to go deal with othe storylines and get back to him - I think I got him to 10% health on my best shot on my first set of attempts. Later, after finishing all other main storylines and much of the rest of the quests, I found Caius a lot easier.

As for the plot, I didn't pay too much attention to it. Having a paradox or two in Caius' story is not a shocker.