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Perhaps Ardas or a mountain archer. But I still think that the legendary warrior is just a reference to the mask, just like with that commander in the Northern War. After all, not everyone can kill a thousand monsters.
Added 1 minute ago
Although, no, then why is his inaction mentioned, if we assume that he went and ran into an ambush... No, he probably isn't a mountain archer.
Added 1 minute ago
Although, no, then why is his inaction mentioned, if we assume that he went and ran into an ambush... No, he probably isn't a mountain archer.