Sister Grail is a young blonde elven women that wears light robes and oversees the shrine of luck in Phandalin
She reveals herself to the Fearsome Five as a member of The Harpers and on close inspection you can tell she is very armed and could probably kick all of our asses.
She was sent to Phandalin to investigate reports of a Banshee named Agatha nearby, in the town of Conyberry. She investigate the Banshee which attacked her. She was seen by Narth coming back to town who told the Fearsom Five

Quests

She offers the Fearsome Five 3 healing potions to deal with the Agatha the Banshee.

• Agatha is reportedly a non-violent Banshee which is why it raised suspicions with the Harpers.
• When she approached Agatha, she was attacked and heard Agatha screaming about a jeweled silver comb