Does anyone know if there are any books or material describing the 4th age? Or any time after the ring was destroyed and sauron was defeated. I'd love to build a campaign based around the 4th age so i;d like to find as much info on it as possible.

We can also use this thread for discussion on what we think would be ok for armies to run in a 4th age campaign. Who do we think would be good baddies, what are armies likely to look like? I mean Gondor is a given, mordor is likely to still have armies of orcs but not sure who would command them. The evil men are still a possible major threat like Harad and the easterlings but allied forces are less likely as they have no force to pull them together.