Under A Hishen Sky will work well using only the 5150 rules but if you also have Infestation, our first scenario book, then you can use those mechanics as well. Under A Hishen Sky introduces the players to new rules. These rules expand and in some cases can replace the original rules. Feel free to pick and choose the rules you wish to add to your 5150 gaming. Under a Hishen Sky covers... The makeup of a typical Hishen Slaver Party. A new type of Encounter called the Pursuit. The G’Narr – A ground to orbit spacecraft used by Hishen slavers. Skills and how they work in the 5150 universe. A new Profession called Nomad. New weapons. A new alien called the Kabasu or Rift Walker. We also revisit Q from the Infestation Scenario Book. Expands: 5150