I'm planning to use the full 20 faction limit for this mod, so if I get lots of ideas from people I'll keep the best ones. Heres and example of the kind of ideas I'm looking for.

Men of Morgul:

After the defeat of Sauron, Gondor reclaimed the ancient fortress of Minas Morgul from the orcs. However, when the new Dark Lord rose in the Fifth Age, the Men of Morgul began to worship him, and became as evil as any orcs. The Men of Morgul are excellent warriors due to their combination of the skill and discipline of Gondorians and the viciousness of the Mordor orcs. Here are some examples of units they could use:

The Black Guard: Similar to Gondors Citadel Guard, these men are heavily armoured and carry a large shield and great halberd for effectiveness against both armour and cavalry. They are highly disciplined, and are the official guards of Minas Morgul.

Morgul Knights: The Men of Morgul were gifted Wargs by the Dark Lord, and taught how to use them well. These Knights are heavily armoured, and ride Wargs, making them fearsome opponents.