Agatha the banshee

Agatha was once a human madly in love, who would have followed her betrothed to the ends of the Realms, but met a bitter end. It is said now that she is a spirit who spends all of her days in a cave desperate to return to her lover, but unable to find peace, as her betrothed has since passed to the other side. She is so desperate, in fact, that she even pursues his living heirs, searching for a way to return to the land of the living. There have been reports of the living communicating with her, but most often to their peril if she sees them as any kind of threat to her or to her pursuit.

The party was given a silver comb by sister Garaele of Phandalin to entice Agatha to speak with the adventurers about the whereabouts of the spellbook of "Bowgentle".  Sister Garaele believes that a character who flatters Agatha's vanity might be able to trade the comb for an answer.