As usual for the encarta series, the devs first about the history of the civ, and then highlight Pacchacuti as the leader. His abilities give him additional resources, reflecting his history as a builder, but they also give boni for fortifications and walls, as he also conqured many of the other tribes in the surrounding. He is also one of the rare leaders to have a malus for craft production.
For all the details, watch the video.