This basically adds Arnor to the game in an 'as-is' way - no effort has been made to improve it to a playable quality, as it took around 3 minutes to make, including switching on the computer. It probably does not work with War of the Ring. For modders, all I have done is changed the line "PlayableFaction = No" to "PlayableFaction = Yes". If you intend to create a full Arnor mod, there is little point in you downloading this one. I do not ask for credit. For non-modders, just mess about with it.
Arnor is almost entirely like the Men faction, with an elven barracks, two elven powers and one dwarven power added. It has its own heroes - presumably all faced in the campaign, which I have not finished - that still show signs of the heroes they are based on. The one who has lightning sword actually uses a Word-of-power style power, where he throws down what I assume is a palantír, and it kills ALL nearby units.