Farkas is the man who brings Coen the invitation to Bakir's Lunar Game. He turns up once you have disrupted enough of Bakir's operations, and meeting him tells you when the games begin.
The Lunar GameThe Lunar Game is the boss quest for the boyar Bakir, a deadly contest at Lunar Manor that unlocks once his anger is maxed. Smart prep before the maze makes the rivals much easier to handle.
Lunar GamesThe Lunar Games is a quest chain built around games held in Vale Sangora. It is your route to the boyar Bakir: max out his anger and his servant Farkas invites you into a deadly tournament.Farkas works on the Lunar Game side of Bakir's court. He is your link between messing with the Mad Khan's lands and finally getting into Lunar Manor.
He appears after you've done enough damage to Bakir's operations in the southwest. Talk to him, then head to Lunar Manor in the Silts before dusk. One 100% route guide suggests dealing with Bakir right after the Farkas sequence rather than during the tournament.