From appendix A in LoTR:
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and she [Arwen] went out from the city of Minas Tirith and passed away to the land of Lorien, and dwelt there alone under the fading trees until winter came...she laid herself to rest upon Cerin Amroth; and there is her green grave
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I still hold that elves would have an immunity to poision, unless someone can point out a place in Tolkien's works where he has stated otherwise.