Cryogenics. An oft-forgotten sentence from
The Silmarillion states
Quote:
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And he was hung from the peak of Thangorodrim in a plastic pod
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Of course, maybe Morgoth just really wanted to get the elves angry, and so left Maehdros out to dry, keeping him well fed. Or maybe a skill of Fëanor's line was the ability to not need nourishment. Lived on rain and the bounty of Eru? Or maybe Morgoth just enchanted him so that he didn't need to eat. We may never know....