In honour of Pragmagik new fakemon region and rewatch all I can find it's time for India and we're using. Hinduism and Buddhism and for the the mechanics of the faction is spiritual enlightenment or opening of the Third Eye.
(Which is also a upgrade.)
And what this means is that all living things that belong to your faction alone go through a journey instead of levels and With each threshold a related building is randomly generated in you main town for free favour for your divinity
Now onto building
You have the Rat temple.
The amber Hall.
Also instead of fortresses you have the Taj Marshals
And for units the humans can be wrestler to warriors, as long they are old fashioned military it's fine.
Also each person can become a different specialist depending on their spiritual journey.
(Rhinoceros warriors for the win!)
For myth units it could be the girl who escaped her awful family by turning into a bird or other such things
For the Titanic creature you can have the Asura who develops and cultivates from how much he fights.
Next up is the cruel Celts and there be some morally choices for the Persians.