Treasure! That word, which had always been so exciting, meant something different now. Fafnir had taken the treasure and turned from man into monster… - Andre Norton

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Treasure! That word, which had always been so exciting, meant something different now. Fafnir had taken the treasure and turned from man into monster because of his greed for it. Mimir, who had been Sigurd’s master and good friend—when the treasure had lain before him, he, too, became a monster, in another way. Then Sigurd had made his choice, to leave the evil, and so he had gone away a hero.