Description
Introduction
The Lost Cities is a mod that allows the player to play in an old abandoned city instead of the normal overworld. When you create your world you can select 'Lost Cities' as your worldtype. You spawn in an old and partially destroyed city that takes over the entire overworld. There are highways, bridges, tunnels, a subway system, tons of dungeons with spawners and loot and so on. There are also various configuration presets (called profiles) to alter how the world is generated.
This mod is very configurable. You can add custom buildings, blocks, control how cities are generated, and a lot more. Documentation on this can be found here: Lost City Wiki
This mod can be used server-side only (so vanilla clients can connect).
Documentation for 1.12
To use it server side you have to use 'lostcities' as the level-type (in server.properties).
Note that there is also a dimension (default ID 111) that you can travel too. This dimension can be disabled (useful if you want this for vanilla clients). But using this dimension you can keep the overworld normal and have The Lost Cities in a dimension. To go there (and back) the current way is to place a bed on top of two diamond blocks and surround it with 6 skulls. Then try to sleep in it.
If Biomes O Plenty is present there is also a Lost Cities (BoP) variant (or 'lostcities_bop' for servers) which will use Biomes O Plenty biomes.
To use a specific 'profile' (configuration profile) on a server you have to add this to your server-properties file:
generator-settings={"profile":"nodamage"}
Documentation for 1.16, 1.18, 1.19, and 1.20
In 1.14 Lost Cities is no longer a separate world type. That means you can use Lost Cities in combination with other world types (like for example, Biomes O Plenty or Wild Nature). To do this you select the world customization option after chosing a world type and press the 'LC' button on the top-right. In this new configuration screen you can enable Lost Cities and also customize various aspects of the generated cities.
The most flexible way to configure Lost Cities for usage on a server is to first create a single player world, hit the LC button and tweak the configs to how you want it. Generate the world and then copy the lostcities-server.toml file that is located in saves/<yourworld>/serverconfig to the server defaultconfigs directory.
Documentation for 1.21
In 1.21 server configs have changed. They can now be found again in the regular config directory. There you can edit the 'selectedProfile' value to the desired profile for your server (this is also used as the default profile for single player). With the 'selectedCustomJson' value you can set specific options. More documentation on how to do this later.
Varia
Also check the companion mod Lost Souls to add more challenge to the buildings:
https://minecraft.curseforge.com/projects/lost-souls
Note! Comments have been disabled because it is hard for me to check for this on too many places. If you want to submit a bug report then go to the 'Issues' tab or here: Lost Cities Issue Tracker. If you want to discuss RFTools in general you can do that here: Lost Cities on my discord
Modpack policy: Feel free to use this mod in any modpack you want.
Preview video:
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What means Verified?
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Compatibility: The mod should be compatible with the latest version of Minecraft and be clearly labeled with its supported versions.
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Functionality: The mod should work as advertised and not cause any game-breaking bugs or crashes.
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Security: The mod should not contain any malicious code or attempts to steal personal information.
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Performance: The mod should not cause a significant decrease in the game's performance, such as by causing lag or reducing frame rates.
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Originality: The mod should be original and not a copy of someone else's work.
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Up-to-date: The mod should be regularly updated to fix bugs, improve performance, and maintain compatibility with the latest version of Minecraft.
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Support: The mod should have an active developer who provides support and troubleshooting assistance to users.
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License: The mod should be released under a clear and open source license that allows others to use, modify, and redistribute the code.
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Documentation: The mod should come with clear and detailed documentation on how to install and use it.
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How to Install
Download Forge & Java
Download Forge from the offical Site or here. If you dont have Java installed then install it now from here. After Downloading Forge you can run the file with Java.
Prepare
Lounch Minecraft and select your Forge istallation as Version this will create a Folder called Mods.
Add Mods
Type Win+R and type %appdata% and open the .minecraft Folder. There will you find your Folder called Mods. Place all Mods you want to play in this Folder
Enjoy
You are now Ready. Re-start your Game and start Playing.