How do you get the ring in Lord of the Rings battle for Middle-earth 2

Once you obtain the ring from Gollum or whom ever you obtain it from, take it back to your Castle, and then you should get the chance to buy a Ring Hero. If you are Men, Elves, or Dwarves, you should get Galadriel and if you are Isengard, Mordor, or Goblins, you should be able to get Sauron himself! Beware, both Ring Heroes cost 10,000 or more so you'd better be saving up!