The bodies of Elves can be killed just like the bodies of Humans, but they can't die of old age or disease. So they can be killed in battle or die of a broken heart, and can also be killed by violent means such as drowning, asphyxiation, poison, etc.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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