[Turin]

1) There are some mercenaries that use special unrecruitable and unsummonable units, which you can easily modify(eternal knights etc) , but most mercs use a recruitable unit which would get changed too if you alter the base unit.

2) no, besides changing the units which are involved in certain events. They would have to be unique to the event though if you don´t want to deal with other side effects of the change.

3) no

4) you can´t mod much in the way of spells besides path requirements, gem costs, researchlevel, magic school and the precision value, so you will be stuck with the old name.

5) I don´t think so

6) Since both soul gate, ashen empire and carrion woods are specific nation themes, they are beyond current modding capabilities. The only thing you can do is change the autospawn units, but this leads to further problems, because most autospawn units can be gained through other means and would change as well.

Special powers in general can´t be modded out, so every nation you would have replace mictlan would have the same blood sacrifice to gain dominion effect.