You are a Guardian of the Last City. You live by your principles: loyalty, honor, justice. It chafes at you that you've heard messages the Drifter intended for someone else. You send him a message to let him know—and further, that you intend to visit him in person.
Visit Drifter in the Annex of the Tower.
Legendary Quest Step
2019.03.05 (Season of the Drifter)