Mordor Warg Riders

Mordor Warg Riders are snaga or jockeys which are ment to ride wargs.
These wargs are bred in Nurn where the food is plenty enough to breed animals and monsters.

There are different types of wargs, the first warg is the fastest but the weakest, the last warg is the strongest and does more damage when charging, but it is the slowest. That means you need to choose your style, you want to be fast? Take the first warg. You want to be attacker? Take the last one. If you want medium of both of it, take middle of these wargs.

Origin
Warg riders weren't that common around mordor until Nurn was shown to be only place where animals can live.

What you need to do to kill or do your job as a warg rider?
Warg Riders in the mod are not ment to kill always but more of a harassment, their fast wargs give them ability to skirmish and shoot their bows at shieldwalls and other formations, and when battle starts the heavier wargs come in place and join the infantry of Mordor and crush the enemies formation allowing the infantry to annahilate the forces of good.