Band of the Marked (and Friends)
Originally from somewhere in Southern Ordos, it seems Leanne is probably from some part of the Tulathi Empire.
Leanne is a priestess of Ioun. She and a small band of Iounians arrived to Havenstone some time ago in hopes of learning more about the new settlers, perhaps spreading Ioun’s word, and receiving permission to reclaim their old Iounian temple within the town.
It appears she led quite the interesting life before joining the Iounians. Or else Iounians have a surprising tendency to train people with garrotes.