Malignus Release Date Is November 12: You Are the Dungeon in This Co-op Colony Sim Inspired by Dungeon Keeper and RimWorld

Malignus launches in Steam Early Access on Thursday, November 12, 2026. Made by indie studio Mossbomb, it's a dungeon colony sim where you are the dungeon: your Boss rules from the throne, your minions dig halls, haul loot and guard prisoners, and you raid the world above for treasure, then defend it against the adventurers who come to take it back. The developer names Dungeon Keeper and RimWorld as its inspirations, and you can play alone or build one shared dungeon in 2-4 player co-op.

Malignus at a glance

When is the Malignus release date?

November 12, 2026, in Early Access on Steam. Mossbomb hasn't announced a launch time or price.

What is Malignus?

You play the dungeon itself. The Steam page breaks it down:

• Carve out your dungeon: dig through rock and fill rooms with workshops, beds, thrones, altars and traps.
• Command six monster races: goblins, kobolds, orcs, gnolls, bugbears and ogres, each with their own strengths.
• Manage personalities: dozens of traits, grumbles and breakdowns mean your minions won't always behave.
• Build deathtraps: dart throwers, spinning blades, flamethrowers, gas, electric coils and webs, wired to pressure plates, tripwires, sensors, levers and timers.
• Defend your hoard: invasions grow bigger, with 6 adventurer races, 10 classes and more than 40 traits. Chain up survivors and interrogate them for secrets.
• Raid the world above: command raids in real time across an overworld that remembers what you did.

Who is your Boss in Malignus?

You rule as one of four Boss monsters, whose powers grow with your hoard. You can also practise the dark arts (Pyromancy, Electromancy, Necromancy and Shadowmancy spells), perform rituals and bargain with dark gods for boons.

Is Malignus co-op?

Yes. Up to four players can rule together and build one shared dungeon in online co-op. Single-player doesn't need an internet connection; online co-op does.

What else is in Malignus?

More than 30 wild creatures live in the caves: build one of nine lair types to tame them as pets, or hunt them for food. You keep the dungeon running by feeding your minions, giving them beds, crafting their gear and keeping order through disasters and tempers. Steam Workshop support is coming during Early Access, and the art is by illustrator khem_.t.

What are the Malignus PC requirements?

Minimum: Windows 10 64-bit, an Intel Core i7-4770 or AMD Ryzen 3 3100, 8 GB of RAM, a GTX 1050 Ti or RX 560 with 4 GB of VRAM (Vulkan) and 3 GB of storage, aiming for 30 fps at 1080p. Integrated graphics need an AMD Radeon 780M or better with 16 GB of RAM; Intel Iris Xe is below the minimum. Mossbomb notes the requirements may change during development.

Watch the Malignus trailer

The official launch trailer plays on the Malignus Steam page.

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