Whistler
This magical blade can only be wielded by a Bladesinger. The myths state when it has no master it will seek out another and call for all the baldesong elves to come and find him.
He was wielded by a Human once during the Great Sacrifice.
I really do try to make most of this original, but since Forgotten Realms is an integral part of the world I can't help if anything is used without formal permission, but is still "fair use" as I am just using this for my private games.