Sorry, missed this post (This forum suite seems to loose track of unread posts too easily
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As for Kagutsuchi. I haven't played Nocturne, so I'm in no way an authority. But I thought your question was rather rhetorical, because it seem's like something is trying to "fix" the world, or at least rebirth. If I'd played the game, I could answer you with some authority about Kagutsuchi's role -- but as he is a final boss, I don't know if he's good/bad or indifferent, or what precisely.... seems like he could be any or all from what little I know.
Just trying to confirm my guesses. Thanks for the answer.
Yeah, Masakado is an optional boss who gives you a new Magatama for defeating him in the Bando shrine.
I was pretty sure that Izanagi & Izanami were in the older games, but now that I think about it I'm not entirely sure.
Erm... I believe you don't actually fight Masakado. If I remember properly, you have a bout with each of the four guardian Kishins, and then you fight Bishamonten. After that, Masakado shows up and gives you the Magatama.