Go to NPC Benil Ordo (east of Northern Wheat Plantation node) and get "Where Did Pigs Come From" quest. Start the questline. Follow through quest chain :

1. Where Did the Boars Come From?
2. Locust Swarm From Somewhere
3. Large Wheat Plantation

Path to NPC Xaviel (NE of Northern Wheat Plantation). Directly behind him there is a dead cow with a soldier and an investigator standing side by side. Get the quest from that investigator.