From Guild Wars 2 Wiki
"Devil" is sylvari who is dressed up for Halloween. During Halloween she can be found wandering about Lion's Arch with a Lionguard. They circle through the four locations with Haunted Doors and Halloween vendors.
Halloween ambient dialogue
- "Devil": I love the smells this time of year. The crisp air, the sweets, the pumpkin pie...or is that just the Mad King's head burning?
- Lionguard: I love this time of year. Halloween scares the heck out of me, though!
- "Devil": Are you scared of ghosts?
- Lionguard: No, I'm scared of trying to squeeze into my Halloween costume after eating so much trick-or-treat candy last year!
- She can be seen being followed by the Mini Gwynefyrdd.