Mutations Update: Enhancing Your CODEX MORTIS Experience
Mutations Update brings fresh chaos to CODEX MORTIS, adding to this necromantic survival bullet hell game for Steam Deck, Linux and Windows. Thanks to GROLAF’s steady creative spark, even more fun to play. Currently on Steam Early Access with 83% Positive reviews. There is a special kind of update that makes you stare at a game you thought you understood. That is exactly the energy behind the Mutations Update for CODEX MORTIS, and since you play on Linux tuned PC or Steam Deck, this one deserves a real look. Eight weeks after hitting Steam Early Access, CRUNCHFEST and GROLAF are not slowing down. CODEX MORTIS is already sitting at Very Positive reviews, with more than 80% of reviews recommending it. That is not bad for a dark, build-hungry action game still growing in public. Now patch number sixteen is landing. Not some tiny balance pass. Not a “we moved two numbers around” kind of thing. This is the Mutations Update, the biggest content drop since launch.
The kind of chaos build nerds dream about
The headline is simple. Mutations are here. There are 249 Mutations across 31 spells, and the big thing is that these are not boring damage boosts. They actually change how spells behave. That matters. A single-target bone spear can turn into a full 360-degree nova. A circular area spell can shift into a four-armed cross. A slow-aura banner can become a burning damage-over-time tool. Summons can transform into fragile, nasty glass-cannon swarms that flood the screen and dare you to survive your own genius. That is the fun part. The wrong build still falls apart. The right build suddenly becomes something weird, violent, and beautiful. As someone who likes releases where the build screen feels like a second battlefield, this is exactly the kind of update I want. It gives experienced players another layer to chew on. It also gives newer players clearer paths into the deeper systems without making the gameplay feel watered down. That is a tough balance. When it works, you feel clever. When it fails, you know it was your fault. Perfect.
Levelling up now has more bite
The Mutations Update also rebuilds the level-up flow around this new system. Before, it could be tempting to chase the same type of upgrade over and over. Now, picks are built to reward composition more than spam. That means your loadout matters more. Your choices matter more. Even the same eight levels can play out in totally different ways depending on what you brought into the run. That is where titles like this live or die. You want that feeling where a run starts normal, then one choice bends it, then another choice twists it, and suddenly your screen is full of undead madness that somehow still makes sense. CODEX MORTIS seems to understand that feeling.
Mutations Update Trailer
It looks alive, even when everything is dead
One thing I really appreciate here is that CODEX MORTIS is not just leaning on numbers and spell icons. The gameplay moves. Every character and every enemy is fully animated. The necromancer’s casting, the restless dead dragging themselves forward, the summons, the swarms, the enemies filling the screen. It all has motion and weight. That matters more than people admit. When gameplay gets chaotic, especially with swarms and spell effects flying everywhere, clean animation helps your brain keep up. The screen can be packed, but it still needs to read well. CODEX MORTIS is going for that sweet spot where the chaos looks wild but still plays clean. For performance-focused players, especially on Linux and Steam Deck, that kind of clarity is huge.
Mutations Update adds to a strong Early Access pace
Since the Early Access launch on March 26, 2026, CODEX MORTIS has already had a busy run. The game has shipped 15 community patches in under two months, with the Mutations Update now arriving as patch number sixteen. It is also Steam Deck Verified by Valve, playable on Linux and Windows, and available in 27 or more languages. There is also an active Discord community helping shape the patch roadmap, which is exactly what you want to see in Early Access. Not silence. Not vague promises. Actual patches, feedback, and movement. That stuff builds trust.
The Mutations Update is live, and the timing is good
To celebrate the launch of the Mutations Update,CODEX MORTIS is currently 20% off on Steam Early Access, for $3.19 USD / £2.71 / 3,19€. The update itself is free for players on Steam Deck, Linux, and Windows. Review keys are also available, which is worth noting for creators, streamers, and smaller outlets looking to cover weird, build-heavy action titles with a strong PC focus. For Linux players, this is the kind of Early Access story I like seeing. A new release, then the community shows up, the developers patch fast, and then the first big content drop actually changes how the game feels. Not just more stuff. More reasons to experiment. More ways to fail. Plus More ways to stumble into a build that feels illegal in the best possible way. That is the hook of the gameplay right now. The Mutations Update does not just add power.
