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Syntax quick reference: *bold* _italic_ [spoiler]hide text[/spoiler] @code@ +underline+ -strike- ^sup^ ~sub~

…Source? Or is this just a wild guess?

Because if we're just throwing out random speculation I'd say that this is from the upcoming 10 season long Netflix series staring Sunstalker Knightsbane and their faithful dragon, Ember Shadowwing, that they ride into battle against the great Moon Beast.