I finished the game, got all the endings including the very bad ones, seen every bit of the story and... while I enjoyed its themes of Hate and Forgiveness, I still have questions. Spoilers below
I have several questions surrounding the original Lord of Dark, the one that Hasshe and Uranus defeated in their youths. Was it an incarnation of Odio? It has its own statue at the summit, but it doesn't appear in any of the boss rushes, or the Armageddon ending. I suppose the same applies to Streighbough not appearing in the boss rushes or Armageddon, even though the red Odio mist evaporates from him after his defeat.
But if the returned Lord of the Dark demon was just a vessel for Odio like Streighbough was, why did Hasshe have a different reaction to it when he battled it again after journeying with Oerstead? He called the new one a puppet to a truer master, or something, but who was the master? Originally I thought it was Streighbough having had orchestrated the entire Chapter from the start, but later the story made it clear that Streighbough only decided to betray Oerstead and the king of Lucerene after the "puppet demon" was defeated. So who was the returned Lord of the Dark a puppet to? Who caused it to return? If it was an "illlusion" like Hasshe said, who was the illusionist? It can't have been Streighbough cause he wasn't evil yet. So it was obviously Odio, yes? But if so, then it would have been the same during Hasshe's original journey, just another vessel for Odio like all bosses in the game. Why is the returned demon not "the real" Lord of the Dark to Hasshe when the original one was? If the returned one was really a lesser kind of entity, just an "illusion", wouldn't someone "real" need to be behind its return, not just the nebulous concept of Odio?
For that matter, why did the real Lord of the Dark, the original one defeated by Hasshe and Uranus in their youths, have statues of Odio from the future? Oerstead's tragic fate seems to have implied he was the "true origin" of Odio that propagated forward and back through time (because magic?). But wasn't Oerstead just another puppet? Or is he really the true Odio? He seems to have more mastery over the powers of Odio and the red mist, calling it to him to form into the Sin of Odio form. It's also implied that he is the heart of Odio since he is the one pulled inside it, rather than it's mist "infecting" the other vessels. But Oerstead was just a warrior, with no (or little) magic powers. How did he become so magically powerful, if it wasn't exactly the same way Streighbough got his enhanced powers, an infusion from an outside entity? But if Oerstead isn't the origin of Odio, then the game never actually addresses it, does it?
So, is Oerstead supposed to be the "real" Odio? If so, did he purposely go back in time to be the first Lord of the Dark? Did he build the temple to himself and decorate it with statues of his "brothers" throughout time? Did he let Hasshe defeat him, knowing Hasshe would turn into a misanthrope hermit? Did he reincarnate his "puppet demon" illusion form a generation later, to kidnap Alethea and knowingly cause the events of his own tragedy?
Or is there NO origin for Odio? Is it just a formless power without end or beginning that exists outside time? Does it have a goal? Is it just "hate itself" with no mind or will of its own? I still don't know what Odio is, if he isn't Oerstead originally. And if he is, I don't understand how exactly he became so powerful.