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This guy is in the banners. He's seen in a trailer. There is literally nothing know about him. No name, nothing.
But there is a screenshot that shows:
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The wolf emblem. Possibly Fenrir? Summons seem to have a big influence on this game. Leviathan seems to be connected to the water based country Accordo.. Niflheim seems to have a dragon emblem, which could be that their protector is Bahamut. So the wolf that's possibly representing Fenrir could be from another country/city.
WHO IS HE?