Agatha

A Banshee living in the ruins of Coneyberry, Agatha was once an elven woman before dying. She mentioned that the last time she had seen the spellbook of a wizard named (missing from notes), and that a century ago it had fallen into the hands of a Necromancer named Siernoth.

Sister Garaele was the one who had asked the heores to speak to Agatha, as her 'bosses' are searching for this spellbook.