The Great Rift guide for Chaos Zero Nightmare (CZN). See how to unlock, boss, mechanics, F2P best team, Meta rank builds, Vanguard, Rearguard, high scores, and leaderboard rewards.
Table of Contents
The Great Rift Second Half Begins
The Great Rift Second Half Schedule
| Schedule | December 24, 2025 after the maintenance – January 14, 2026 before the maintenance |
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Progress The Story to Unlock
You will need to advance the story to Chapter 3 Episode 7 to unlock the Second Half of The Great Rift.
Galactic Disaster GuideHow to Play
| Challenge Mechanics |
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| Form two teams to battle an unkillable boss. Rankings are determined by the total damage dealt to the boss. Each team can only play for a limited number of turns, and the battle ends once the turn limit is reached. You can obtain [Record Rewards] based on the highest score you achieve within the limited number of turns. You can obtain [Weekly Cumulative Rewards] based on the total score you accumulate over the week. * Weekly Cumulative Rewards reset every Sunday at 18:00 (UTC+0). * All Record Rewards and Weekly Cumulative Rewards are reset at the end of the first half of the season. |
Get First-Half Ranking Rewards
Upon entering the Lobby after the second half begins, you will receive ranking rewards from the first half.
Vanguard Team Guide
Boss Information
In the Vanguard Team phase, you will face one Suppressed Servant and three Scratchers. Scratchers are resummoned each time they are defeated.
Prioritize Defeating the Scratchers
The Suppressed Servant requires you to remove the Remnants of Thought within a certain number of turns. In the first half of the battle, you can reduce the Remnants of Thought by defeating Scratchers, so focus on attacking the Scratchers at the beginning.
Attack Using Remaining Thoughts
Once all the Remnants of Thought are removed, many Remaining Thoughts will be created in your hands. Remaining Thoughts can inflict Vulnerability on enemies while drawing cards, so use them effectively to deal damage.
Aim to Clear Within 5 Turns
Depending on the number of turns remaining in the first half of the battle, the number of turns in the second half will increase by up to 5. To increase your score, aim to clear the first half as quickly as possible.
Recommended Vanguard Team Formation
For the Vanguard Team, a formation centered around Mei Lin is recommended. It's easy to deal serious damage with her Unity of Attack and Defense and Rising Dragon Spire, which is useful for whittling down high-HP bosses.
Strategy
- Whittle down the Scratchers with Veronica
(A Save Data that creates a Giant Ballista is recommended) - Once all the Remnants of Thought are gone, use Remaining Thoughts
- While applying buffs with Rei, focus on chipping away at the boss with Mei Lin's Unity of Attack and Defense
- Use Rising Dragon Spire at the end
(An Epiphany that depends on the number of Passion Cards used is recommended)
Other Recommended Characters
| Character | Recommendation |
|---|---|
| Yuki | - An Attacker with a Weak Attribute advantage - Defeat all minions at once with an AoE Attack - Easy to make use of Inspiration |
| Hugo | - An Attacker with a Weak Attribute advantage - Also effective for support via drawing cards |
| Nia | - Increases stability with support via drawing cards - Decibel is also easy to activate |
Rearguard Team Guide
Boss Information
In the second half of the battle, the Suppressed Servant appears alone. Even after its HP is fully depleted, it will not be defeated, and you can continue to deal damage to it.
Use a Formation with a High Number of Attacks
In the second half of the battle, you need to remove the Remnants of Thought by attacking the boss. Since a high number of attacks is required, make use of Mika, who can restore AP, and Tressa, who can increase your number of moves.
Utilize Thought Fragment
In the Rearguard battle, by removing all the Remnants of Thought, Thought Fragment will be created in your hands. These are also Cards that allow you to draw, so use them while dealing damage.
Recommended Rearguard Team Formation
For the Rearguard Team, a formation with Tressa as the Attacker is recommended. Cycle through the deck with , and increase your number of moves while supplying AP with Mika.
- Use Shadow Reload with an Epiphany on an Upgraded Card
- Create a Shadow Dagger with Mika's Heal
- Once all the Remnants of Thought are gone, use Thought Fragment
- Cycle through the deck and repeat, making use of Cassius's Full House and Joker.
Tips for Conquering The Great Rift
Manual Play is Recommended
While auto-play is available in The Great Rift, it leads to inefficient progress because it's difficult to adapt your strategy to the mechanics on auto-play. Since increasing your score is crucial in this content, be sure to play manually.
Create Save Data in Season Chaos
In The Great Rift, you can only use Save Data created in Season Chaos. Farm Season Chaos and aim for a Save Data that is highly suitable for conquering The Great Rift.
Reference Other Players' Data
In The Great Rift, you can check other players' formations from the Merit Ranking. Try building your formation by referencing players on the leaderboard, examining formations you can create with your own characters, and analyzing the composition of their Save Data.
What is the Great Rift?
High-Difficulty Score Attack Content
The Great Rift is a score attack style Event held during Galactic Disaster. The damage you deal and other factors are added to your score, and you can earn rewards based on that score.
Score Acquisition Conditions
| Summary of Score Acquisition Conditions |
|---|
| - Awarded based on the amount of damage dealt (The score gained gradually decreases after a certain amount of damage) |
| - Awarded based on the difficulty level |
| - Gain 300% of the amount healed (Rearguard Team only) |
| - Gain 300% of the damage blocked by a Shield (Rearguard Team only) |
| - If damage is perfectly blocked with a Shield, the defense score increases by 110% (Rearguard Team only) |
Two Parties are Required
To clear The Great Rift, you will need two parties: a Vanguard Team and a Rearguard Team. The score acquisition conditions are different for the Vanguard and Rearguard teams, so you must prepare formations suited for their respective roles.
Three Types of Rewards Exist
In The Great Rift, there are three types of rewards: Cumulative Score Rewards, Score Achievement Rewards, and Ranking Rewards. Even beginners can obtain materials and other items by repeatedly taking on the challenge.
Cumulative Score Rewards
Cumulative Score Rewards are reset weekly. You can get 270 Crystals and 4,000 Pure White Fragments, so take on the challenge every week to reach a score of 500,000.
Score Achievement Rewards
For Score Achievement Rewards, you receive rewards based on the high score you achieve in a single challenge. You can get all rewards by achieving a score of 500,000, but since the main reward is a sticker, you should just aim for the highest score you can achieve.
Ranking Rewards
Ranking Rewards can be obtained based on your rank, which is determined by your high score at the end of The Great Rift period. The main reward here is also a sticker, so for starters, make sure to participate in The Great Rift to secure your rewards.
Two Types of Great Rifts Held During the Event Period
The Great Rift is held twice, during the first half period and the second half period. During the week when the period renews, you can earn cumulative rewards for both sessions, so don't forget to take on the challenge early.
How to Unlock The Great Rift
Unlocked by Clearing Galactic Disaster Chapter 2, #7
The Great Rift is unlocked by clearing Chapter 2, #7 of the Galactic Disaster, Forbidden Catalysts.
Chaos Zero Nightmare Related Guides
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Galactic Disaster 
S1 Forbidden Catalyst
Nebula Distortion
Early Game Guide
Daily Tasks
Recommended Gacha Banner
Ark City Guide
Card Epiphany Activation
How to Use Ego Skill
Stress Management
Weakness Attribute Guide
Safe Zone Guide
How to Restore Aether
How to Raise Captain Grade
ID Card Settings
Battle Pass (Arkhianon Supply) Guide & Should You Buy?
Simulation Guide
Twin Star's Shadow Guide
How to Download & Sync Data
Deep Trauma Guide
Latest Updates 
Intermediate Captain Promotion Guide
Unigram Guide
Character Enhancement Guide
How to Set and Upgrade Partner
How to Upgrade Potential
How to Use Save Data
How to Upgrade Manifest Ego
Memory Fragments 
Prism Modules
Daily Reset Time
Zero System
Counseling Guide
Omega Codes
Redeem Codes
