AVA IS THE ONE WHO KILLED STRELITZIA AND I HAVE PROOF!!!
1) Remember how we noticed that the silhouetted figure was Lauriam, but discredited it the second we found out he was her brother? Yeah, I have explination for him beign there in a moment.
2)Also remember why Strel was there. She was chasing you and Chirithy told her he just saw you enter that building.
Now at this moment I would like to remind you all of something. Which is:
Ok, now that I have that out if the way I'm sure you're thinking: "What? No. She's a foreteller. Why would she do that?"
4)Because she's the traitor. She become as such the second she attempted to strike Luxu down after learning of what all they've been doing has been leading up to. As we know, she failed and he is thriving in his role still.
Her motive for her actions is, to he blunt, a last ditch effort to stop all this. How? By striking Strelitzia down and replacing her with someone she thinks might ruin that pattern in which things are SUPPOSED to fall in place.
This also explains how her killer knew she had a book. Because her killer is the one who GAVE her the book.