From Guild Wars 2 Wiki
Priestess Rashenna is a ghost found near the Wreckage of Serenity, Deserter Flats. She doesn't appear until you interact with the object Rashenna's Grave. Testing indicates that Rashenna will only appear for necromancers.
- Welcome to Serenity Temple. What is it that burdens your mind, my child?
Sorry to interrupt your rest. I mean no harm.
- Your presence is no bother. You're an interesting change from the unhappy ghosts I usually meet here. Let me give you a gift. May the Goddess Mother Dwayna watch over your steps and carry you through the darkness.
- Thank you.
- I wish I knew. Good-bye.