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This is the first time I've read this story; I didn't know it existed. https://docs.wildfiregames.com/design/gameplay/main/war-story.html From what I understand, there are many ideas that were never implemented.I imagine it's just a roadmap of where take ideas. It strikes me as odd that the nomadic mode is present by default. Units receive bonuses if they fight on their own territory... The Mill acts as an exception, allowing resources to be exploited outside the territory.( Very interesting). Reinforcement system. I imagine it's similar to AoE III. You can send units to your ally through the tribute system. Ships can be captured if their crew is eliminated. Docks automatically repair nearby ships.

First look at https://gitea.wildfiregames.com/0ad/0ad/src/branch/main/binaries/data/mods/public/simulation/components/UnitAI.js I think the first thing you will need is some tools that allow you to quickly search for a certain keyword in ALL files in 0AD.  For example, inside UnitAI.js you would see cmpAttack.IsTargetInRange, then you need to search for where is it defined.  You will be keep moving between many files, and up and down within a 5000 lines file.  You will easily get lost if you don't have a convenient tool. I personally use Emacs, but I don't think you will want that.  Perhaps ask ChatGPT if they have better tools suggestion for you.

This is how civilizations begin in 0AD. First approach is a factionless civilization, something generic...

Thx for the clarification. I was already suspecting something like this. It's a bit sad for me that they are not part of the Germanic civilization since they are probably the most famous tribe for the average player.