Let the Wind Blow Where It May

You can only get one of two achievements from the Immortal in a Vase. Find it in the Exalting Sanctum, east of Realm-Keeping Commission Chancery and attack it to trigger dialogue. Then come back a day later to get achievement.

Probably a reference to the Bible, John 3:8, stating: "The wind blows where it wishes, and you hear its sound, but you do not know where it comes from or where it goes. So it is with everyone who is born of the Spirit.” It means that things can be mysterious and not fully understandable by humans, much like how the wind moves invisibly and unpredictably.