You need this Resource as Dependency: https://www.spigotmc.org/resources/advancedworldcreatorapi.89100/

DeepDark for 1.18.1 requirements:
AdvancedWorldCreatorAPI version 2.3
Deepdark version 2.5.1

This Plugin creates a new Dimension called the 'Deep Dark'.
I had this idea because of the Extra Utilities mod which had also a Deep Dark Dimension.

To enter this Dimension you need to place Respawn-Anchor under a End-Portal. If you then jump in this Portal you will get teleported into the Deep Dark. You can leave this Dimension if you click on a Respawn-Anchor with Glowstone-Dust.


- Modification of the Paper configuration file "paper.yml" to be ready for plugins that generate worlds and avoid error and warn messages in the server console:

watchdog:
early-warning-every: 5000000
early-warning-delay: 100000000

Deep-Dark:

- Mobs have increased Health,Speed and Damage
- If your too long in the darkness you will get Damage (configurable)
- Giant columns will randomly spawn to support the roof (configurable)
- Random deep holes spawn from y=0 all the way down to y=-640 (default) (configurable)
- Default ores will spawn from y=-640 up to y=0 (more then in the overworld, and without height limitations for each ore)
- Some Structures (Geode, Monster Room, Caves) will spawn with a very high chance


(underground structures, many geodes, many monster-rooms)


(main-space of the deep dark with giant columns)


New look after 1.21.3 #3 Version

Commands:
- /deepdark - shows all Commands for Help
- /deepdark reload <ores/settings/mobs/all> - will reload the configs to refresh most things like mob-settings
- /deepdark loadDefaults<ores/settings/mobs/all> - will load the defaults into the configuration files
- /deepdark refresh - unloads and loads the Deep Dark to apply mostly all effects

Permission: deepdark.change

Help with the settings:
https://github.com/FreeSoccerHDX/DeepDark