‘There at last when the mallorn-leaves were falling, but spring had not yet come, she laid herself to rest upon Cerin Amroth; and there is her green grave, until the world is changed, and all the days of her life are utterly forgotten by men that come after, and elanor and niphredil bloom no more east of the Sea.
‘Here ends this tale, as it has come to us from the South; and with the passing of Evenstar no more is said in this book of the days of old.’
(from “The Tale of Aragorn and Arwen”, LotR Appendices)
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If like me you always found Arwen dying alone too unbearably sad, you may have imagined her bros Elladan and Elrohir with her at the end, or her grandfather, canon be damned.