Velicia will be with a group from the Guild, arguing with the Stone Lord's thugs on a beach in Rivington. This beach is accessed by following the path west of South Span Checkpoint to an area with a ship which sailed from Moonrise Towers at X: -212 Y: 87.
If the Guild is assisted, Velicia helps them to unload goods from the ship.
If Velicia is killed, she can be spoken to with Speak with Dead. Velicia explains that the Stone Lord and the Guild were fighting over territory, control and smuggling valuables. She further reveals that she was a Harper, who infiltrated the Guild to observe their movements.
Party member: Who are you?
Archer Velicia: Harper... Infiltrated the Guild...
Party member: Who were you fighting?
Archer Velicia: Stone Lord's thugs... threat to us all...