I'm under the impression that in Odysseia, Odysseus visits the gates of underworld, where he has a conversation with Achilles. This conversation made the character of Achilleus even more tragic, as he doesn't live in glory in the after life, only in mourning. So in a sense, it made all of his heroics vain.
Source, Grimbergs World History, please do correct me if my memory fails me.
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