Hey I like your ideas. It seems that what you are suggesting is that in a regicide king, each faction should get a special king unit and castle.Of course, each king unit should have some sort of special ability and the castles should be pretty strong.In addition, the King unit should have abilities similar to trains soldiers like the daimyo.
As for the Sioux Warlord (since warchief is the explorer), he should be able to simply hide and move amazingly fast. And since the Sioux are more prone to a normadic lifestyle. The Sioux Warlord - similar to the warchief auras - should not get a castle, but a defense aura, which could be seen as a fortification in itself. The Aztec King should have a very small island castle, since that was their center of power. As for the Chinese, they should have their emperor Kangxi - one powerful figure in history. Who will have access to the Forbidden City. The Iroquois could have a special European fort. They were well known for their trade and diplomatic relations with the Europeans.
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