StellarStellaris
The Arcology Project decision now starts a situation for the planet to transform the planet into an Ecumenopolis, so you can continue creating buildings on your planet while it transforms just like Machine or Hive Worlds. Hive and Machine worlds can now be improved!

If you have an existing save, please use the "ACPS Mod Configuration" decision to update the new features, otherwise you may be missing content!

Notice: Screenshots are currently outdated

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Ecumenopolis Construction Situation:

The cost for enacting the project is reduced to 2,000 Alloys and 200 Influence. The cost difference is made up with a situation upkeep costs.

  • Standard Deadlines: Finishes in 10 years if used exclusivly
  • Accelerated Deadlines: Finishes in 7 years if used exclusivly
  • Extreme Deadlines: Finishes in 5 years if used exclusivly


Most of the situation choices are tied to your Ethic, Civics, and Origins selections!

The Research / Education options for individual empires are limited based on the Leaders on your council instead of Ethic, Civics, and Origins. You need 2+ associated leaders on your council to prompt the option (Ruler does not count). See Empire Design Spoilers Here

Ascension Cities are not shown in the images above as there is too much variation. They essentially give you an extra ascension building or planetary feature (e.g. nanites), including all its bonuses, as a Planetary Deposit.


Hive and Machine World Improvement Situation:

After terraforming (or finding) a Hive or Machine world, you now have the opportunity to improve it via the "Improve Machine World" or "Improve Hive World" decision.

All of the choices are driven by origins and civics (hive occasionally has an additional lithoid vs biological requirement)
See Empire Design Spoilers Here

The Ascension deposits for Hive and Machine worlds are similar too the ECU ones.

Enacting the costs 500 energy and 150 influence, and the Deadline approaches cost cost variable amounts depending on if you're a machine, organic hive, or lithoid hive.

  • Standard Deadlines: Finishes in 6 years if used exclusivly
  • Accelerated Deadlines: Finishes in 4 years if used exclusivly
  • Extreme Deadlines: Finishes in 2 years if used exclusivly



Ecumenopolis Refurbishment Situation:

If you conquer or find a premade ecumenopolis without the improvements from this mod, you can launch a refurbishment situation to update the old ecumenopolis to be shiny new and improved!

Enacting the project is free, and the Deadline approaches cost the same as the Construction Situation, but without minerals.

  • Standard Deadlines: Finishes in 2 years if used exclusivly
  • Accelerated Deadlines: Finishes in 1.5 years if used exclusivly
  • Extreme Deadlines: Finishes in 1 year if used exclusivly




DLCs:

Megacorp is needed if you want Ecumenopoli
Megacorp is needed if you want Relic Worlds
Utopia is needed if you want Hive Worlds
Synthetic Dawn is needed if you want Machine Worlds


Load Order & Compatibility:

Not compatible with other mods that change the Arcology Project decision

ECS is fully compatible with the mods listed below; load ECS below the mods listed here:
Real Space - New Arcologies
Planetary Diversity - More Arcologies
Relic World Flavour
Feature Preserver
Note: if you add either of the above mods after generating the galaxy, please use the Mod Compat Refresh decision to ensure the security and the continuing stability of your modded galaxy

ECS is likely compatible with the mods listed below:
City World Flavour: Not fully tested, but I haven't seen any issues so far


Overrides:

Arcology Project Decision - changes effect to trigger the situation

  • decision_arcology_project

Restore Ecumenopolis Decision - changes effect to trigger the situation

  • decision_arcology_project_relic

Orbital Ring Modules - added effects from the final decision in the situation to the modules.

  • orbital_ring_habitation
  • orbital_ring_shipyard
  • orbital_ring_gun_battery
  • orbital_ring_missile_battery
  • orbital_ring_hangar_bay
  • orbital_ring_hatchery
  • orbital_ring_beastport
  • orbital_ring_vivarium_tank

Biologist to Ranger Conversion - to make ecu ranger building convert biologists to rangers

  • biologist_is_ranger_trigger



Future Plans:

Expansion for Capital and Sector Capital special features based primarily on origin and authority - ah, more work for me to do eventually 🙃
TitleAscension Planets Construction Situations (APCS)
Steam ID3493833184
Steam App281990 (steamDB)
Steam Manifest/UGC2228667941994621686
Creator SteamID76561198220557329
Steam Created2025-06-05T19:43:50+00:00
Steam Updated2026-05-06T05:16:30+00:00
Steam Updated relative159.9 days ago
Revision #142
Revision archived?NO!
Revision file date
Tracked Steam files29
Tracked mod files0
Mod size2.63 MB

Tracked mod revisions

Title Revision # Archived? Size Metadata created Metadata last updated
Ascension Planets Construction Situations (APCS) 145 NO 1.15 MB 2026-10-10 12:49:35 2026-10-10 23:05:01
Ascension Planets Construction Situations (APCS) 144 NO 1.14 MB 2026-10-10 12:29:28 2026-06-16 08:05:02
Ascension Planets Construction Situations (APCS) 143 NO 1.13 MB 2026-10-10 11:58:54 2026-05-31 08:05:01
Ascension Planets Construction Situations (APCS) 142 NO 2.63 MB 2026-10-10 11:57:48 2026-05-06 15:05:01
Ascension Planets Construction Situations (APCS) 141 NO 1.12 MB 2026-10-10 11:03:08 2026-05-06 05:05:02
Ascension Planets Construction Situations (APCS) 140 NO 1.12 MB 2026-10-10 10:57:55 2026-03-23 15:05:01
Ascension Planets Construction Situations (APCS) 139 NO 1.09 MB 2026-10-10 08:56:57 2026-03-19 23:05:01
Ascension Planets Construction Situations (APCS) 138 NO 1.09 MB 2026-10-10 07:53:13 2025-12-12 03:05:01
Ascension Planets Construction Situations (APCS) 137 NO 1.1 MB 2026-10-10 07:25:17 2025-10-19 00:05:01
Ascension Planets Construction Situations (APCS) 136 NO 1.06 MB 2026-10-10 06:37:56 2025-09-22 18:05:01
Ascension Planets Construction Situations (APCS) 134 NO 1.06 MB 2026-10-10 06:33:06 2025-08-14 03:05:01
Ascension Planets Construction Situations (APCS) 133 NO 1.06 MB 2026-10-10 06:28:12 2025-08-10 06:05:01
Ascension Planets Construction Situations (APCS) 132 NO 1.06 MB 2026-10-10 06:28:12 2025-08-05 23:05:01
Ascension Planets Construction Situations (APCS) 131 NO 1.06 MB 2026-10-10 06:26:16 2025-08-05 22:05:01
Ecumenopolis Construction Situation (ECS) 57 NO 851.63 KB 2026-10-10 06:02:53 2025-08-04 05:05:01
Ecumenopolis Construction Situation (ECS) 56 NO 851.63 KB 2026-10-10 05:38:43 2025-07-14 17:05:01
Ecumenopolis Construction Situation (ECS) 55 NO 851.56 KB 2026-10-10 05:37:45 2025-06-23 18:05:01
Ecumenopolis Construction Situation (ECS) 54 NO 839.73 KB 2026-10-10 05:37:45 2025-06-22 22:05:01
Ecumenopolis Construction Situation (ECS) 52 NO 834.05 KB 2026-10-10 05:31:25 2025-06-22 18:05:01
Ecumenopolis Construction Situation (ECS) 51 NO 1.53 MB 2026-10-10 05:28:21 2025-06-21 01:05:01
Ecumenopolis Construction Situation (ECS) 50 NO 814.3 KB 2026-10-10 05:26:30 2025-06-19 05:05:02
Ecumenopolis Construction Situation (ECS) 49 NO 812.94 KB 2026-10-10 05:25:33 2025-06-17 00:05:02
Ecumenopolis Construction Situation (ECS) 48 NO 832.35 KB 2026-10-10 05:25:33 2025-06-16 17:05:01
Ecumenopolis Construction Situation (ECS) 47 NO 811.42 KB 2026-10-10 05:24:46 2025-06-16 04:05:02
Ecumenopolis Construction Situation (ECS) 46 NO 790.1 KB 2026-10-10 05:22:12 2025-06-16 03:05:02
Ecumenopolis Construction Situation (ECS) 44 NO 768.27 KB 2026-10-10 05:22:12 2025-06-14 02:05:02
Ecumenopolis Construction Situation (ECS) 43 NO 768.35 KB 2026-10-10 05:22:12 2025-06-13 23:05:02
Ecumenopolis Construction Situation 42 NO 768.34 KB 2026-10-10 05:21:26 2025-06-13 22:05:01
Ecumenopolis Construction Situation 41 NO 783.38 KB 2026-10-10 05:21:26 2025-06-13 04:05:01
Ecumenopolis Construction Situation 40 NO 761.99 KB 2026-10-10 05:21:26 2025-06-13 03:05:02
Ecumenopolis Construction Situation (ECS) 39 NO 761.81 KB 2026-10-10 05:20:08 2025-06-13 02:05:01
Ecumenopolis Construction Situation 38 NO 750.15 KB 2026-10-10 05:19:22 2025-06-12 00:05:01
Ecumenopolis Construction Situation 37 NO 731.24 KB 2026-10-10 05:17:18 2025-06-11 08:05:01
Ecumenopolis Construction Situation 36 NO 704.11 KB 2026-10-10 05:12:23 2025-06-09 22:05:02


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