Chaos Zero Nightmare is celebrating its first anniversary with a major update that combines new seasonal content, character additions, gameplay improvements, and limited-time rewards. Smilegate released the update on October 21, introducing the fifth Galactic Disaster season, A Promise Upon the Snow. For players managing their Chaos Zero Nightmare Accounts, this is a good opportunity to collect anniversary rewards while exploring the latest changes to combat and progression systems.
The anniversary update is more than a routine content refresh. Alongside seasonal Combatant Rossweisse, players can experience a new Chaos zone, additional Partner effects, improved card customization, and a separate management mini-game. The Nightmare Festival also provides substantial free rewards, making this update relevant to both returning players and those who have been following the game since launch.
Nightmare Festival: Anniversary Rewards and Free Rescues
The Nightmare Festival is one of the biggest attractions of the first-anniversary update. Running through December 2, the celebration gives players multiple opportunities to obtain characters, Partners, and progression resources without relying entirely on regular gameplay rewards.
One of the main highlights is the daily Rescue reward. Players can claim 10 free Rescues per day, with the event offering up to 70 free pulls in total.
Other important anniversary rewards include:
| Reward | Details |
|---|---|
| Free Rescues | Up to 70 pulls |
| Combatant Selection | 5-Star Combatant Selection Ticket |
| Partner Selection | 5-Star Partner Selection Ticket |
| Crystals | 1,600 Crystals |
| Additional rewards | Character summon currency and special stickers |
The selection tickets deserve particular attention. Unlike random acquisition opportunities, selection rewards give players more control over their account development. This can be especially useful for players who need a specific Combatant or Partner to improve their existing team composition.
We recommend prioritizing the daily check-ins and limited-time activities rather than leaving everything until the final days. Some rewards are tied to participation, so simply logging in near the end of the festival may not be enough to collect everything.
Season 5: A Promise Upon the Snow and New Story Content
The fifth season of Galactic Disaster introduces a new storyline titled A Promise Upon the Snow. The story begins after the Captain and their crew are stranded by an unidentified disaster, eventually arriving at a mysterious Chaos zone known as Celestial Bulwark.
This new setting introduces additional story developments involving the gods and their apostles. Rossweisse, an apostle serving Kyrken, the Goddess of Cycle, becomes one of the central new characters. The storyline also explores secrets surrounding another deity, Diallos.

Celestial Bulwark is not simply a location for story progression. Players can also collect special event currency by participating in its content and exchange that currency through the accompanying supply shop.
The available exchanges include:
- Character acquisition currency.
- Character growth materials.
- Other seasonal progression resources.
From a progression perspective, this creates another reason to participate in the new seasonal content. Players can advance through the story while collecting resources that support their wider account development.
Rossweisse: Understanding Her Dual-Card Combat Mechanic
Rossweisse is the featured Combatant of Season 5. She has the Justice attribute and fills the Striker role, with a character design influenced by her position as an apostle of Kyrken.
Her visual design incorporates Obangsaek, the five traditional Korean colors, alongside a weapon inspired by the Saingeom sword. Players interested in her background can also explore her Trauma Code, which was released alongside the update.

How Flickering Sword Works
The most interesting part of Rossweisse's gameplay is her core card, Flickering Sword.
Rather than functioning as a conventional single attack card, this ability introduces a two-card interaction system.
| Mechanic | Function |
|---|---|
| Flickering Sword | Core card that creates two separate cards |
| Light | One of the two resulting cards |
| Dark | The other resulting card |
| Card interactions | Playing other cards triggers effects involving Light and Dark |
| Card combination | Specific conditions allow both cards to merge into one |
| Final effect | The merged card unleashes a powerful skill |
The important detail is how these cards interact with the rest of the hand. Light and Dark are placed at opposite ends, creating a mechanic that requires players to pay attention to card positioning and the sequence of their actions.

In our view, this is the aspect worth understanding before building a team around Rossweisse. Her mechanic is not simply about playing the highest-damage card whenever it becomes available. Players need to understand how other cards trigger interactions and how to satisfy the conditions required for the final combination.
However, the exact optimal card sequence and damage potential should be evaluated through actual gameplay rather than assumed from the skill description alone.
New Gameplay Systems, Partner Passives, and Cosmetic Upgrades
Beyond the new seasonal character, the anniversary update introduces several system improvements. Some are directly related to combat preparation, while others provide additional customization options.
Exploration Passive for Partners
Partners now receive an Exploration Passive system that provides beneficial effects to the entire party during Chaos and Sortie gameplay.
The number of available buff effects depends on Partner rarity:
| Partner Rarity | Exploration Passive Effects |
|---|---|
| 4-Star Partner | 2 effects |
| 5-Star Partner | 3 effects |
This addition gives Partners another consideration beyond their existing role in character progression.
When preparing a team, players can now pay attention to both their primary combat setup and the additional party-wide benefits provided by Partner passives. It also creates another reason to review existing Partners instead of focusing exclusively on newly acquired characters.
Select Divine Epiphany
Another useful addition is Select Divine Epiphany.
Previously, editing Save Data could involve less direct control over the desired Divine Epiphany. The new feature allows players to apply the Epiphany associated with their preferred god to cards during Save Data editing.
For players who regularly adjust their builds, this is a meaningful quality-of-life improvement. It provides greater control over customization and makes it easier to work toward a specific card setup.
Card Skins and Special-Grade Outfits
The anniversary update also expands cosmetic customization through two additions.
Card Skins change the illustrations displayed on Combatant cards. The feature was originally showcased during an April Fools' Day event but has now become an official part of the game.
Meanwhile, Special-grade outfits offer more extensive customization than standard appearance changes.
These outfits include:
- Modified character motions.
- Unique card appearances.
- Dozens of exclusive voice lines.
The distinction is important. Card Skins primarily affect the visual presentation of cards, while Special-grade outfits provide a broader character customization experience.
For players who enjoy collecting character cosmetics, this is one of the more noticeable additions outside the main seasonal content.
Nightmare Dream Park: Mini-Game and Charity Campaign
The anniversary celebration also introduces Nightmare Dream Park, a separate management-style mini-game available from October 21 through December 23.
Instead of focusing on conventional combat progression, this activity asks players to develop their own Dream Park by constructing different facilities.
The basic gameplay loop revolves around three activities:
- Construct facilities to expand the Dream Park.
- Improve the park to increase visiting Combatants' satisfaction.
- Generate profits through the park's development.

This provides a change of pace from the card-based combat and resource management that define the main game.
There is also a charity component connected to the mini-game. Smilegate is organizing a donation campaign through its Hope Studio platform to support undernourished children.
This gives the anniversary celebration a community-focused element beyond the usual in-game reward structure.
Summary
Chaos Zero Nightmare's first-anniversary update combines a new Galactic Disaster season with meaningful account progression opportunities and several long-requested gameplay improvements.
For players deciding where to spend their time, we recommend prioritizing the following:
- Collect anniversary rewards: Take advantage of the free Rescues, selection tickets, and Crystals before the Nightmare Festival ends on December 2.
- Explore Season 5: Progress through Celestial Bulwark and collect seasonal shop currency.
- Learn Rossweisse's mechanics: Understand the Light and Dark card interactions before committing to a specific team setup.
- Review existing Partners: Check the new Exploration Passive effects when adjusting party compositions.
- Try Nightmare Dream Park: Participate in the management mini-game before its December 23 conclusion.
Overall, the update offers more than a new character and a limited-time celebration. The combination of additional customization, improved Save Data editing, Partner passives, and seasonal activities gives players several reasons to revisit their existing progression plans.
FAQ
How many free Rescues are available during the first-anniversary event?
The Nightmare Festival offers 10 free Rescues per day, with up to 70 free pulls available through the event.
When does the Chaos Zero Nightmare anniversary event end?
The Nightmare Festival runs through December 2, while the Nightmare Dream Park mini-game remains available until December 23.
Who is the new Season 5 Combatant?
Rossweisse is the featured Combatant. She has the Justice attribute and Striker role, with a core card mechanic built around the interaction between Light and Dark.
What does Select Divine Epiphany do?
It allows players to apply their preferred god's Divine Epiphany to cards when editing Save Data, providing more control over card customization.
Are Special-grade outfits different from regular costumes?
Yes. Special-grade outfits include changes to character motions, unique cards, and dozens of exclusive voice lines, making them more comprehensive than ordinary appearance changes.