Gas Giants a large planet of relatively low density consisting predominantly of hydrogen and helium. A brief and to the point suggestion to add gas-giants PERKS . gas filtering for resources . hard to access bases and facility's  such as a prisons "ect" . hiding spot if deep enough . catch asteroids in there orbit  . disposal of unwanted rivals .scuttle ships  .Hydrogen reactor fuel CONS . BIG  . Hard to access . Have to make