The War for Arnor is a modification for Battle for Middle-Earth 1, which plans to add Arnor faction and adding an Angmar faction in future while revising all other factions.
In southern themed maps Mordor will have extra unit rooster.
Haradrim Riders will be a summon but in desert they will be recruitable (shield is removed ingame)
Black Easterlings is a special type of unit that will be unlocked by a spell from Haradrim Tents, stronger than normal Easterlings.
Mahud is the Haradrim hero of Mordor. He will lead the haradrims into battle.
Thanks to RadagastTheMusical for Easterling model which I've edited.