Swamped

It's an empty package. There's words all around the box, but they're not in any language you recognize...

Wait, hold on. They're not in a language you know, but you think one of the books Marshall was looking at used these characters. Does that mean this came from the eastern continent?

Maybe, but on the other hand, you aren't certain of where those books came from. Not like you had much chance to look into it. Still, whatever the story is, that's strange.

Hold on. Weren't there two books, and Marshall said one seemed like a cipher for the other? Maybe this is just the cipher. It's not a particular language, it's just a way to keep secrets. In which case, the real message could be in any language.

Well. In that case, why not try to break it if that language happens to be Common? There's a fair number of words here, you might get somewhere if it's just a substitution cipher. Not likely to pay off, but there's no harm in making a quick attempt at it.

Much to your surprise, you actually start getting somewhere. There's a set of three that keeps popping up, so you guess THE for it. Then you end up with T--TH in a couple of places - perhaps TRUTH. There's also a TEETH but you don't have enough context yet to say for sure that's wrong, odd as it sounds.

After trying out a few more promising patterns, though, you think you know what the message says.