When you craft the Staff of herding, there is no clue how to use it. Was it revealed through datamining or by the developpers?
closed as not constructive by Drake, LessPop_MoreFizz♦, fredley♦, OrigamiRobot, bwarner May 30 '12 at 12:20
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It would be pretty unusual to not figure it out on your first play through Act I after you got the staff. The place where you use it is right along the path to the first quest outside of New Tristram. When the big ghost of a cow rises up out of a corpse, you tend to pay attention.