Demetrios1453
Legend
Thank you.
OK, it's available from D&D Beyond now. And, as I suspected, it's nowhere bad as it has been made out. Elves who have pleased the Seldarine upon death experience Transcendence - their souls go to Arvandor for an indeterminate time, and then are eventually reincarnated. Conversely, to directly quote from the book:
"Elves who die of old age without experiencing Transcendence are believed to have been denied admission to Arvandor, and thus their souls pass on to other planes and are never reincarnated. The living are left to guess why this might be true, but an elf’s conduct during life often offers a clue. Drow never experience Transcendence, for example, and the same is true for elves who turn to the worship of gods other than the Seldarine."
So elves and drow who do not experience Transcendence have their souls go to other planes, permanently as they are not reincarnated, BUT the souls are not extinguished entirely.