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Metropolis&Megalopolis Upgrade – Enhanced City System

⭐ Metropolis&Megalopolis Upgrade – Enhanced City System
Megalopolis Upgrade – Enhanced City System expands the vanilla city progression by adding a new location rank between City and Megalopolis: Metropolis.

The goal of the mod is to make urban development more meaningful, balanced, and rewarding throughout the game — instead of instantly jumping from a City to a late-game powerhouse.



🏛️ New Location Ranks

Rank Type Purpose

City Vanilla Standard developed settlement
Metropolis NEW A large major city — stronger than City, but not overpowered
Megalopolis NEW The ultimate late-game urban giant


🌐Compatch released for Extended Authority – Forts & Bailiffs.
Fixes missing Castles / Stockades / Cathedrals inside Metropolis & Megalopolis.

🔗 https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3606624495

Load order: base mod → Extended Authority → compatch (bottom)


⚙️ Progression & Balance

Metropolis is now the intermediate step toward a Megalopolis
→ More capacity, more buildings, more population — but no hard limits.

Megalopolis becomes rare and expensive, truly representing the greatest cities in history
→ High population + high development requirements
→ 5000 gold upgrade cost
→ Expanded goods demand
→ Limited per-province (auto-downgrades if capital changes)


🧠 Province Capital System

To prevent abuse (e.g., forcing multiple Megalopolises per province):

If a Megalopolis is located outside the Province Capital,
and the Province Capital later changes, then
→ The old Megalopolis will downgrade back to a City after 1 month
(ensuring only one true Megalopolis per province)

🎨 Polish & Visuals

New custom icons for Metropolis and Megalopolis

UI text updates for clarity and immersion

Compatible with current game version.
Save-game compatible (upgrading may require one month tick).


3️⃣ Better RGO → City Transition (Community Tweaks Integration)

In the base game, promoting Town → City inside RGO provinces sharply reduced RGO % and made the region inefficient.

This mod integrates logic inspired by Community Tweaks, ensuring upgraded urban areas keep reasonable economic performance:

RGO scaling reduced only to ~80%–70% Max RGO Size instead of collapsing

RGO provinces upgrading to City/Town remain usable, productive, and logical

Much more realistic rural → urban transition simulation

This results in stronger city building, better regional development, and a more natural economic curve.


⭐ 📌 Credits
🟦 Idea Variation II – Inspiration for the Original Metropolis Rank

Massive thanks to Flogi for his excellent work.
His idea of a Metropolis rank in Idea Variation II inspired this standalone Megalopolis system.

🔗 https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3599735023&searchtext=idea

🟩 Community Tweaks – RGO Behaviour Logic

Thanks to the Community Tweaks team for their smart approach to making RGO provinces remain efficient when upgraded to Town/City.
This mod adapts that concept into its own balancing.

🔗 https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3604207425&searchtext=community


⭐ 📌 Future Implementations

New Megalopolis-exclusive buildings

Special effects and modifiers for high-tier cities

Possibly “Imperial Capital” and “Cultural Capital” variants are possible.


⭐ 📌 Feedback

If you have balance suggestions, ideas, bug reports, or improvements you’d like to see, feel free to comment.
All constructive feedback is appreciated — this mod will continue to evolve!


🌍 🌐 TRANSLATIONS & COMMUNITY PROJECTS
Chinese Translation:
Thanks to 牛奶大魔王 for making the mod available for the Chinese community.
🔗 https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3599706198

If you translate the mod to another language, feel free to comment —
we will add your link here with credits!


⭐ 📌 Compatibility

Should work with most mods that do NOT override location ranks or add any new buildings. If you have any just comment and i will try to make a patch.

Not Ironman and achivement compatible.

Safe to add mid-game (but upgrade conditions apply).