This NPC and the event associated with it spawns on progression servers when Gates of Discord unlocks.
Zonewide message on event start in South Karana: "The aviaks have become restless and resent the merciless attacks on their village. They have called out their best warriors to take back their home."
Zonewide message on event end in South Karana: "The aviaks are satisfied for the moment, but are watching all visitors carefully."