basically u gotta find Gollum. hes running around the map as an NPC hero, and he has the ring. u kill him, u get it and rush it back to ur fortress. cuz any unit who posses the ring, will be seen by anyone who is on the map. thus making u the prime target. ofcrouse recruiting those two costs a lot of money. and they are slow to summon. but once they on they will destroy eerything