Nation suggestions
 

I hope this is the right place to put this.

First, a Native American nation should be implemented. Nearly every human civilization is in Dominions, but not the Native Americans of the Southwest. The Hohokam, Anasazi, or even the Apache tribes would make great bases for new nations.
Anasazi and Hohokam culture have a very rich mythological background. National summons could be Kokopelli, or totem animals like coyotes and crows.
For continuity, the American Indian civilizations interacted frequently with the Aztecs, Toltecs, and Mayans, the genitor of Mictlan. Thus, some sort of link between the two could be mentioned. There were also some religious similiraties between the two culture groups: gods such as Quetzalcoatl were shared.
Unit wise, the nation would probably be centered on light infantry (very light- remeber the clothes those redskins wore in the ole Westerns) with lots of unique abilities, like etheral, berserk, or transforming. The nation would also be heavy on magic, with powerful priests (as one would expect any shamanist culture).
It should be noted, however, that this nation would not be Mictlan without swamps and jungles.
Firstly, the Natives had knowledge of archery, so they wouldn't be using slings. Also, they had a strong spirit and totem based religion- the Aztec deities were much more physical, more present. Blood sacrifice would also be omitted. Finally, combat style would be different. The tribes aforementioned did not use macanas, nor did they use the hardened cotton armor of the Meso-Americans. The prospective nation would probably be more sneak, hit, and run as opposed to swarm.

My next idea would be for a post-colonial Machaka. The late age saw Marignon expandind and colonizing and evangelizing. Machaka must surely have been found by them, and their disappearance from that era to me is disappointing.
It would probably be similar to Machaka, but with limited sailing, iron weapons, and a ruling caste of either mulattos or colonists. There would also be a heretic aspect of Voodoo cults, that, while magically powerful, corrupt the converted Machakans back to the old ways.

Just my ideas. If the modders or devs like them, don't hesitate to implement them!

Re: Nation suggestions
 

Dominions II had an Oglala mod. You could try upgrading it for Dom3 if you're interested in seeing an American Indian nation. Making it work shouldn't be that difficult, but rebalancing might be hard.

Re: Nation suggestions
 

Dr Praetorius made an LA machaka mod I believe, with features very similar to those you propose.

The Haida Gwaii mod by Foodstamp represents native,... canadians I guess you'd call them. The tribes to the north of the plains who mostly lived their lives around fishing.

Re: Nation suggestions
 

There are the LA Atlantians, with a far north american feel to them.

Re: Nation suggestions
 

I'm still hoping for a Muspelheim nation :D

Re: Nation suggestions
 

Mictlan is very much drawn from the Aztec it seems to me.

Re: Nation suggestions
 

Oh jeez, all this time I've been thinking Canadians live their lives around hockey and beer.

Re: Nation suggestions
 

I hear there's a strong link between fishing and beer :)

Re: Nation suggestions
 

You mean like Abysia?

Re: Nation suggestions
 

Abysia is different from Muspelheim thematically and in terms of history. It's an original creation of the devs, not based on any mythology as such. Besides, KO has made some comments about a Muspelheim nation but AFAIK that's just conceptual stuff, nothing that has been done or is currently in the works.