Chaos Zero Nightmare – Stream Summary 20.12.2025

If you have missed the recent stream that revealed Sereniel and the next update coming to the game, check the details below!

Stream

You can watch the stream here:

Update release

The update will become available on 24th December 2025.

New character – Sereniel

Sereniel is an Instinct Hunter who specializes in dealing high Toughness damage. Whenever she Ravages an enemy, she will get her signature card back in her hand to use again – and it seems she can also create a lot of 0-cost cards too.

What’s very important is that Sereniel is a limited character that won’t be added to the general pool after her banner ends. You can still buy two of her dupes in the store, like with every new character, and the Omega Code will also work on her, though.

Sereniel PV

New partner – Peko

Peko is a signature Partner for Sereniel. She can increase the damage dealt to Ravaged enemies.

Similar to Sereniel, she’s also a limited Partner.

December updates

Here’s a list of other updates that will be added to the game with Sereniel:

The Fast Forward feature will be added to the events – it will allow you to ‘skip’ the conversations that happen for every event in Chaos,
The animations for characters’ skills have been improved, so they are faster now,
When you reach max dupe on a 5-star character, if you receive another dupe of them, you will get a new currency, Spectral Cube. You can trade the cubes in the Exchange Shop for other character dupes and other materials,
They plan to improve the localization quality (again),
Great Rift Part 2 will open, featuring a new boss and a new set of buffs,
- Ravage will become very important, which makes sense considering Sereniel’s kit,
Core of Discord (the ‘third’ boss in Lab 0 Chaos) will be replaced with Haku,
Dellang Shop will be added to Unidentified Areas.

Roadmap

Here’s the roadmap for the first half of 2026, including seasons 2 and 3.

Season 2 Information:

Zero Archive:
- The Agent Collection will be improved, and a new Archive will be added where you can view monsters and equipment by planet in one place. In addition, a new Lore Collection covering terminology, characters, and events will be introduced.
Touch reactions will be added for Combatants in the lobby, café, and restaurants. In future updates, additional interactions are planned, such as dining together at the Starshine Diner or receiving unstable DMs depending on the Combatant’s mental state.
New character: Narja
- To be released in January,
New character: Nine
- To be released on 4th February,
New character: Tiphera
- To be released on 25th February,
A new event that will span the whole season will be added: Galactic Martial Arts Tournament Event
- New content where Monster Cards obtained by defeating powerful enemies can be incorporated into your Save Data and used in combat.
Season Board will be added:
- A Season Board feature will be added, allowing you to track seasonal challenges and progression. Special medals obtained through the Season Board can only be earned by completing challenges during the corresponding season.
Spiral Tower of Screams:
- The Spiral Tower of Screams is a regular content where you conquer a tower by freely combining decks. There is no turn limit, and you simply progress by clearing each floor in order. The tower features up to 150 floors and offers rewards such as token stickers and growth currency.
The Borrow Save Data feature will be added:
- You will be able to borrow friends’ Save Data to play. Each friend’s Save Data can be borrowed once per day and can only be used in Simulation dungeons.
Growth Difficulty Care – Protos Sync System & Growth Adjustment System
- The Protos Sync System will be introduced to temporarily scale a selected Combatant’s level, potential, and Memory Fragments to a set threshold. This allows untrained Combatants to be deployed into Chaos right away, making it easier to test various deck compositions and deck-building strategies.
- Prior to the Protos Sync System, a new mode will be added to Galactic Disaster – Chaos that allows any Combatant to be deployed immediately during the season, with their level and stats scaled to an appropriate growth stage even without Potential or Memory Fragments.
- Save Data can still be obtained as usual, allowing you to freely and comfortably experiment with deck-building or prepare decks in advance within Season Chaos.
The Guild Office will be added,
- Weekly mission requests can be accepted through the Guild Office. Completing objectives like boss subjugations or Chaos purification rewards players with large quantities of Crystals of Discord and growth currency.
New Zero System upgrades:
- The Zero System Upgrade will be completely reworked.
- Stage 1: Accessibility Permission increases basic steps and Epiphany activation rates.
- Stage 2: Authority Expansion introduces effects such as encounters with Divine Representatives that influence stages and increased chances for rare Unidentified Areas to appear.
- Stage 3: Administrator Mode provides powerful effects, including additional Divine Representative choices and increased Divine Epiphany activation rates.
  - Long-requested features such as “reapplying Epiphany to cards that already have it,” or “selectively duplicating cards,” will be introduced as upgrade effects.
  - Additionally, during each season, a season-defining skill tree called “Environmental Variables” will be added.
Codex improvements:
- Within the Codex, a Unique Option called the Divine Intervention event will occur at a certain probability. By encountering the gods and clearing these events, the Zero Archive will be unlocked. Through the Zero Archive, you will be able to learn more about worldbuilding elements related to the gods. Each god may also grant access to a special “Fate” with powerful effects.
- A new Unique Codex will be introduced, offering a completely different experience from standard Chaos gameplay through fixed level design and special objectives.
Balance adjustments:
- Unpopular Common Cards will be buffed,
- Nei, Rei, Orlea, and Cassius will receive a buff to their healing cards,
- Underutilized builds, Unique Cards, and Epiphanies, including those related to Yuki, will receive buffs.
- Some Partner passive effects will be improved,
- Cassius and Tressa will be nerfed, though, as they seem too strong, and the devs will provide a way to reset them and get resources back. Additional context to the nerfs:
  - Currently, the synergy between these two characters generates an excessive amount of cards beyond what was originally intended, resulting in a level of power that heavily disrupts game balance. This has also led to unusually long battles—often three to four times longer than normal—which has increased overall player fatigue.
  - The development team believes that this situation undermines the integrity of the game’s overall design and overwhelms other strategic options, ultimately diminishing the diversity of gameplay experiences available to our Protos. For these reasons, we have decided that adjustments are necessary.
  - As the goal is not to weaken the Combatants themselves, adjustments will instead focus on addressing mechanics that threaten the overall game design, thereby preserving the long-term value of the player experience. While unintended functionalities will be fixed, our top priority is to preserve each character’s intended role and relative value as much as possible.
  - Even after these changes, Tressa will continue to shine as one of the game’s strongest damage dealers. Cassius will also receive additional buffs alongside the adjustments, ensuring he remains an appealing and competitive option moving forward.
You will be able to customize your player card now using various stickers and backgrounds,
Memory Fragments improvements:
- The UI layout for managing Memory Fragments will be improved for greater clarity. Preferred main and sub options for each Combatant will be highlighted, making Memory Fragment management more intuitive. Instant upgrades will be available through a separate pop-up, and upgraded options will be clearly displayed.
The story skip feature will be added,
Simulation Dungeons will be improved:
- Simulation repeat counts will be removed, and a reward multiplier feature will be introduced. When using multipliers, entry Aether consumption will increase, rewards will scale accordingly, and only 1 wave will need to be cleared. A speed-up button will also be added to skip Unidentified Area animations within Chaos.

Images of new characters (Season 2):

Narja, Nine, and Tiphera in order:

Season 3 Information:

Full voiceover will be added to the Trauma Code,
The counseling system will be improved and made more interactive,
Chaos Assault:
- One of the core appeals of the roguelike genre lies in navigating constant threats and choices while striving for optimal strategies and simply surviving the run. Chaos Assault is new content designed to further embrace this roguelike experience.
- Chaos Assault is intended for Protos who wish to experience Chaos Zero Nightmare more deeply as a roguelike. Unlike the existing Chaos, which begins relatively safely in outer regions, this mode starts immediately in far more dangerous and lethal areas.
- With interventions from various gods, the core gameplay flow becomes more intense and threatening, while new deck-building elements are added to overcome these challenges.
- We are also developing this as a high-difficulty mode featuring stronger and more varied monsters, along with new penalties.
- Additionally, by disabling certain existing systems such as the Discard pile system, Chaos Assault will be introduced as a constraint-free roguelike challenge mode that allows for more liberated play beyond traditional balancing mechanisms.
Purification Protocol
- Purification Protocol is a content where Combatants must be deployed across multiple areas to defeat the malware codes to restore a hacked system.
- Unlike standard combat, Stress levels do not reset between stages, requiring careful Combatant deployment.
- To counter these challenges, a system called Code Breaker will be available.
- Code Breakers are support effects that can be selected upon entering a stage.
- These support effects can be requested once a specific gauge is fully charged, with the gauge filling each time certain conditions are met.
- To survive critical moments, it is essential to choose Code Breakers that synergize with your setup and actively use their support effects at the right time.
Corruption Mode:
- Some characters will receive power-ups that change their playstyle,
- It won’t be a direct buff, but rather something that changes some of their cards or lets them get new effects in their kit,
- Hugo and Orlea are confirmed as the first two who will receive this update.
- More information about this:
  - To confront the escalating threat of Chaos, Combatants will gain access to a new power. “Corruption” is a new growth system designed to enable Combatants to challenge stronger Chaos threats.
  - Beyond simple stat progression, Corruption introduces new effects and skill changes that allow existing Combatants to shine in new ways and enable fresh build possibilities. Corrupted Combatants will also receive unique Breakdown visuals, dialogue, and designs, revealing an entirely new side of each character.
  - This system will be rolled out sequentially per Combatant and is currently targeted for its first release in Season 3. We look forward to seeing Combatants who have struggled in the meta, or those solidified into standardized builds, demonstrate renewed strength through Corruption.

Other information:

Main story rework is still in progress.

More information

For more information, check the developer notes that were released after the stream. Find them here.

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