I went to look that up myself, and I realized: there is a real dearth of information about the underwater region of the Sea of Fallen Stars. Starting at https://forgottenrealms.fandom.com/wiki/Sea_of_Fallen_Stars, and then clicking upon Seros, really shows the limited amount of info available. I was honestly surprised.
Especially since that fantastic accessory written by Mr. Schend is out there. What a fantastic accessory it is! :)
Best regards,
Asharak
Posted - 06 Apr 2020 : 16:16:50 Thanks, I should have put it together.
George Krashos
Posted - 06 Apr 2020 : 08:54:28 It's the fall of the sea elven kingdom of Keryvyr in the Eleventh Serôs War in 942 DR.