Source-checkedMaps & scenarios

Dunkle Festung

by Corruptor2026 · for Factorio

Dark co-op survival for 1–8 players. Hold your own island fortress in a ring around the Citadel while endless hordes adapt to your defences. How long can you hold out? Or can you take the Citadel?

21Downloads
11d agoLast updated
MITLicense
Factorio Mod PortalSource

About Dunkle Festung

From Factorio Mod Portal

Dark co-op survival for 1–8 players. Hold your own island fortress in a ring around the Citadel while endless hordes adapt to your defences. How long can you hold out? Or can you take the Citadel?

Dark Fortress

The world has gone dark, and out of the dark they come.

Dark Fortress turns Factorio into a long co-op survival game. Every player holds their own fortress on an island in a ring around the Citadel. Between you lies land that is not yours yet. Out there, the hordes are waiting.

What awaits you

  • Your own fortress: an island protected by water, with a keep around your headquarters. If it falls, your fortress is lost.
  • Real co-op: neighbours share a connector island. Take it together and your fortresses grow closer.
  • Hordes that adapt: waves grow with time, research and your firepower. They look for weak spots and do not always attack where you expect.
  • A world worth exploring: wrecks, log books, outworks with rich resources, and things better left alone.
  • Atmosphere: permanent dusk, lanterns, fog, a hellish land around the hives.
  • Two endings: hold out as long as you can, or try to take the Citadel.
  • Made for long sessions: a full game takes roughly 50 hours.

Details

  • 1 to 8 players. Players 1 and 2 start next to each other.
  • Base game only. Space Age is optional.
  • Every map is generated from its seed: same seed, same map.
  • Languages: English and German (follows each player's Factorio language).
  • Settings: difficulty, fog, brightness, wave warnings and a horde size multiplier you can change during the game.

Compatibility

  • Optional support for Explosive Biters.
  • Not compatible with RampantFixed (it replaces the enemy AI).
  • Other mods that change map generation or enemy behaviour may conflict.

Getting started

Enable the mod and start a new freeplay game. The map is built after the game starts, so the map preview in the "New game" screen does not show it. Read the short intro, search the wrecks near your headquarters, and get ready.

Useful commands: /dkf-intro, /dkf-info, /dkf-diag.

Feedback

Found a bug or have an idea? Please post in the discussion tab with the wave number, a screenshot and, if possible, the output of /dkf-diag.


Deutsch: Dunkle Festung ist ein düsteres Koop-Überlebensspiel für 1 bis 8 Spieler. Jeder hält eine eigene Festung, die Horden passen sich eurer Verteidigung an. Wie lange haltet ihr stand? Oder könnt ihr die Zitadelle sogar einnehmen? Die Mod ist komplett auf Deutsch spielbar.

Highlights

From source data

Footprint

Rated a light load on a server.

License

Published under MIT.

Last update

Its author last shipped an update 11d ago.

Dunkle Festung on Nxeon

From our catalogue
One-click install
Supported on Nxeon Factorio servers. We download it from Factorio Mod Portal, place it, and restart the server.
Server side
Required on the server
Server load
light
Smallest plan we suggest
Factorio — 2 GB (2 GB RAM). This follows our own load rating above, not a benchmark.
Latest build
0.23.0, released 2026-10-24

Recent builds

BuildReleasedGame versionsLoaders
0.23.02026-10-242.1n/a
0.22.12026-10-242.0n/a
0.22.02026-10-242.0n/a
0.19.52026-10-202.0n/a

Dependencies

Declared by the newest build that lists any. Required ones are installed with it on one-click installs.

Run Dunkle Festung on a Factorio server

Pick a server or deploy a new one above; it is installed in one click.

What kind of mod it is

From the catalog
Listed on Factorio Mod Portal as “Mods”

Maps & scenarios

Custom maps, arenas and scenarios to play on.

Runs on your server

From source side support

Factorio Mod Portal lists Dunkle Festung as required on the server. Check its Factorio Mod Portal page to see whether players need it too.

Compatibility

Game
Factorio
Runs on
Serverrequired on the server

Verified at the source

  • ✓Factorio Mod PortalOfficial listing, checked 2026-10-29Open ↗
  • ✓AuthorCorruptor2026, as published on Factorio Mod Portal
  • ✓LicenseMITFree

Dunkle Festung, answered

Generated from the mod’s own source data.

Do my players need to install Dunkle Festung?

Factorio Mod Portal lists Dunkle Festung as required on the server. Check its Factorio Mod Portal page to see whether players need it too.

Is it free?

Yes. Dunkle Festung is free to download from Factorio Mod Portal. Its license is MIT.

How do I add it to my Nxeon server?

Use “Add to a server” on this page, or open NxLabs from your dashboard. We install it, restart your server and switch it on.

NxLabs

Run Dunkle Festung on a Factorio server.

Deploy in about a minute from $2.99 a month, then add Dunkle Festung in one click.