I remember reading in an interview somewhere, that the reason this isn't part of the Main series, is because its ending is really bad(As in, really sad and horrifying and tragic, not bad as in, they put no effort into it) and they didn't want to do that with a mainstream game, which is why Vs. XIII is not technically part of the main series.
Maybe the Ending could be that after the journey Noctis and his friends take, maybe they cause some kind of Armageddon, and end up killing everyone, or something like this.
I remember reading in an interview somewhere, that the reason this isn't part of the Main series, is because its ending is really bad(As in, really sad and horrifying and tragic, not bad as in, they put no effort into it) and they didn't want to do that with a mainstream game, which is why Vs. XIII is not technically part of the main series.
Maybe the Ending could be that after the journey Noctis and his friends take, maybe they cause some kind of Armageddon, and end up killing everyone, or something like this.