The soulless king is book on the idea that there was a seceret and more dangerous titan not directly connected with The founder Yimr. This titan is supposed to only be reborn, should the titans of Yimr go on a rampage killing more of eldias people than the titans themselves. Once reborn it restarts the clock, by killing all Yimr titan users. This makes the power of the nine reset randomly with a random eldian anywhere in the world.
Anyways I'm not the author of AoT, but I'm damn well the author of this fanfiction so enjoy. Peace.
Yeah hello....this fanfiction is being re-done by yours truly, I felt that their were points where the story could be considerably remodeled, the name of the remake is the same, and has a few chapters released with it, I highly suggest reading it, I have a finer idea to reanalyze and reorganize the story. Please check it out.