Assigned by Reward Required Location Preceded by Followed by Herd the yakows into their pen Requirements Trophy type Herd the yakows into their pen was a mission that Jak and Daxter completed to obtain a power cell in The Precursor Legacy. The Farmer's yakows got out of their pen when some strange creatures tried to steal them earlier, Jak herded them back into the pen for a power cell. After herding all the yakows into their pen, the mission was temporarily renamed to Return to the Farmer.