@Zansultan Hi, thank you for having so much interest in my work. Are you talking about "They came from below" story. If so I will answer your questions
I don't understand what you mean by faction, are you talking about the main characters?
As for the titans, there will be some action In the upcoming chapters.
The events take place just after the Marley has won the mid East war, in the middle of the one month timeskip between end of the war and Willy Tyburs declaration of war.
I don't think I'm going to make plot twists, it's more just a reimaging of the 2005 war of the worlds movie but just in AOT world.
No, the aliens have nothing to do with titans powers or the worm.
If I have time I will make a series based on multiple characters perspectives of what was happening during the invasion and how they were dealing with it