Agatha

General
Agatha is a banshee who lives inside a large tree in Melithyr Forest. She appears to be elven.

"They came upon a tree, with a burrow beneath, shrubbery and vines twisted to create doors."

She is known to hoard and desire shiny and important items.

The Rangers of Eamonn
The Rangers sought out Agatha at the behest of Sister Serdrostine, who was searching for a spellbook belonging to a wizard named Percival.

Upon arrival at her home, Agatha initially responded poorly to Mallory's attempt to charm her (by commenting on her furniture). Athorell eventually succeeds by appealing to their elven commonality. Agatha tells them about Percival's spelbook.