Well, I think the confusion is mainly caused by lack of backstory and voice lines. First of all, who is "I"? What happened to "I"? Why did "I" show up in a Viking house? Who do those bodies belong to? However since you will do some explanation in Chapter 2, I guess those problems will all be solved. As for voice lines, I know how a centurion will attack when he shouts "Īnfirmus" or "incredibilis" out because I have played the game, but for people who don't play the game, they may get confused. For it seems no reason that a man shout something like "incredible" or "the die is cast" out in a deadly battle, right? Also I agree with those voice lines may break atmosphere in your story. Latin phrases are cool, but personally I suggest you to bring them up only when they are suitable for the story. And explanation in parentheses may interrupt rhythm of story.