TLDR Version: They're Great
I suspect that a few peoples main use of Eucomenoplis is Fen Habbanis which is kind of broken at least in regard to the other precursor events. There is not much disadvantage to the Ecumenopolis except they they require pops and resources to plug into them. In easy way to look at them is as a giant filter and the apex of your empire with the rest of your planets acting as resources to plug into them. Finding Fen Habbanis early is great due to being able to create alloys very fast but what happens if you are not farming the required start or you are playing MP and you don't get it? Well there is another way. Allow me to introduce the Micro Ecumenpolis. You can skip this if you do fid Fen Habbanis
The Micro Ecumenopolis
Some people may think that Ecumenoplois are a late game thing as it will take a few years and assemble one on a size 22-25 city and cost 20k minerals + the city districts. How about building one in the 2250's or 60's?
Well basically find a size 10 planet and terraform it preferably for 2k energy. This clears all the tile blockers off it. Then you build 10 city districts and you can get your 3rd ascension perk around 2250's as well. You will need 20k minerals which might be difficult but its doable. To save up 20k you will need a few silos on your starbases. HIt the button and you have a size 10 Ecumenopolis. And you will get it in a similar timeframe as Fen Habbanis.
Now why create a size 10 city planet? Well it will take decades to get more than 100-150 pops anyway so a size 10 one in 2060's or 70's is functionally better than Fen Habbanis anyway which only has 6 districts initially. While some players can tech rush the voidborne perk you can get this in the same time frame. 10 segements is plenty to work with early on. The tempo of the game makes a size 10 Ecumenpolis way more valuable than a size 25 one 100 years later and the size 25 one will take centuries to fill (with normal growth rate see below). Note this will be your 1st Ecumenpolis you're going to use it to get more. My record is 5 size 20+.
So how do you fill a Ecumenopolis in a hurry or at least a few districts.
1. Bioengineering fertile trait+ Xeno-compatibility perk.
Basically you stack all the growth rate options+ decisions+ edicts. If you grab a few smaller planets early they will have excess population you can send to Ecumenopolis. With migrants+ refugees I had 3 Ecumenopilis and 2 ring worlds being filled, the problem was building new districts and jobs for them
2. Synthetic Ascension
The 2 ascension perk lets you create pops very rapidly. If you have some unassimlated organic pops of a different species you can have a population explosion. Send the excess to your Ecuomenopolis.
3. Raiding.
You can get the raiding bombardment via a civic or ascension perk. This has 2 effects on an opponent. 1. You steal their pops to ill up your worlds. Ecumenpolis have 100% habitability. The downside is they can't do most of the advanced jobs just clerking and entertainers if you change the slavery type. Not 100% sure but you do not have to slave but keeping them happy may be problematic any advice or experience there please share.
So what can you do with a Ecumenopolis? They basically obsolete civilian consumer goods production and forges as you do not to fuel them with crystals or explosive motes. And they are very efficient at turning minerals into consumer goods. You can also produce trade/amenities via the city districts and unity. With 15 pops per residential and 5/10 jobs on commercial districts/megaplexs you can create a massive Ecumenoplis that will likely take decades to fill.
Also don't overlook unity production. You can stack a heap or leisure districts + holo theatre buildings. Slaves can do entertainer jobs if you allow them. Nother useful trick is a tomb world can be turned into one unlike terraforming it into a gaia world or hive world were you have to convert it into something else then into the world you want.
And that is basically it. Some tricks I have discovered with them. If you want to go tall that humble size 10 planet you may have overlooked may be able ot produce enough alloys to help you build the matter decompressor in a black hole and at that point you can go forth and conquer.
I suspect that a few peoples main use of Eucomenoplis is Fen Habbanis which is kind of broken at least in regard to the other precursor events. There is not much disadvantage to the Ecumenopolis except they they require pops and resources to plug into them. In easy way to look at them is as a giant filter and the apex of your empire with the rest of your planets acting as resources to plug into them. Finding Fen Habbanis early is great due to being able to create alloys very fast but what happens if you are not farming the required start or you are playing MP and you don't get it? Well there is another way. Allow me to introduce the Micro Ecumenpolis. You can skip this if you do fid Fen Habbanis
The Micro Ecumenopolis
Some people may think that Ecumenoplois are a late game thing as it will take a few years and assemble one on a size 22-25 city and cost 20k minerals + the city districts. How about building one in the 2250's or 60's?
Well basically find a size 10 planet and terraform it preferably for 2k energy. This clears all the tile blockers off it. Then you build 10 city districts and you can get your 3rd ascension perk around 2250's as well. You will need 20k minerals which might be difficult but its doable. To save up 20k you will need a few silos on your starbases. HIt the button and you have a size 10 Ecumenopolis. And you will get it in a similar timeframe as Fen Habbanis.
Now why create a size 10 city planet? Well it will take decades to get more than 100-150 pops anyway so a size 10 one in 2060's or 70's is functionally better than Fen Habbanis anyway which only has 6 districts initially. While some players can tech rush the voidborne perk you can get this in the same time frame. 10 segements is plenty to work with early on. The tempo of the game makes a size 10 Ecumenpolis way more valuable than a size 25 one 100 years later and the size 25 one will take centuries to fill (with normal growth rate see below). Note this will be your 1st Ecumenpolis you're going to use it to get more. My record is 5 size 20+.
So how do you fill a Ecumenopolis in a hurry or at least a few districts.
1. Bioengineering fertile trait+ Xeno-compatibility perk.
Basically you stack all the growth rate options+ decisions+ edicts. If you grab a few smaller planets early they will have excess population you can send to Ecumenopolis. With migrants+ refugees I had 3 Ecumenopilis and 2 ring worlds being filled, the problem was building new districts and jobs for them
2. Synthetic Ascension
The 2 ascension perk lets you create pops very rapidly. If you have some unassimlated organic pops of a different species you can have a population explosion. Send the excess to your Ecuomenopolis.
3. Raiding.
You can get the raiding bombardment via a civic or ascension perk. This has 2 effects on an opponent. 1. You steal their pops to ill up your worlds. Ecumenpolis have 100% habitability. The downside is they can't do most of the advanced jobs just clerking and entertainers if you change the slavery type. Not 100% sure but you do not have to slave but keeping them happy may be problematic any advice or experience there please share.
So what can you do with a Ecumenopolis? They basically obsolete civilian consumer goods production and forges as you do not to fuel them with crystals or explosive motes. And they are very efficient at turning minerals into consumer goods. You can also produce trade/amenities via the city districts and unity. With 15 pops per residential and 5/10 jobs on commercial districts/megaplexs you can create a massive Ecumenoplis that will likely take decades to fill.
Also don't overlook unity production. You can stack a heap or leisure districts + holo theatre buildings. Slaves can do entertainer jobs if you allow them. Nother useful trick is a tomb world can be turned into one unlike terraforming it into a gaia world or hive world were you have to convert it into something else then into the world you want.
And that is basically it. Some tricks I have discovered with them. If you want to go tall that humble size 10 planet you may have overlooked may be able ot produce enough alloys to help you build the matter decompressor in a black hole and at that point you can go forth and conquer.
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