Captains! The Zero System is the most rewarding high-difficulty mode in Chaos Zero Nightmare (CZN) - a harder, upgraded version of Chaos Manifestation that offers better Save Data, exclusive loot, and a deep upgrade system powered by Chaos Orbs. Whether you're just unlocking it at Captain Level 40 or looking to optimize your farming runs, this Chaos Zero Nightmare Zero System guide covers everything: how Codexes work, all upgrade trees, Chaos Orb tips, and the best rewards to chase.
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What Is the Zero System in Chaos Zero Nightmare?
The Zero System is a high-difficulty version of Chaos Manifestation with added restrictions that make each run more challenging. Because of these restrictions, the Save Data you create in the Zero System is significantly more valuable than what you'd get from a normal Chaos run - letting you carry over more powerful cards and equipment.
CZN Chaos Manifestation and Zero System
Unlike regular Chaos Manifestation, the Zero System doesn't let you set the chaos yourself. Instead, the game generates a randomized difficulty run called a Codex. Think of it as conditional chaos - the game hands you a challenge with built-in penalties, and you have to work around them.
CZN Zero System
The Zero System becomes available after reaching Captain Level 40 (Expert Captain). Once you hit that milestone, the game will walk you through a tutorial and the mode will appear alongside Chaos Manifestation in the Chaos menu.
What Is a Codex?
A Codex is the foundation of every Zero System run. When you start, you choose from three Codex options - each with different penalty combinations and difficulty levels. Codexes can have one to three penalties depending on rarity, with higher rarity Codexes offering greater Chaos Orb bonuses at the cost of making the run harder.
CZN Codexes
Common Codex penalties include:
- Tyrant - Enemy Attack and Health increase by up to 40%
- Plague - Your team's Max Health decreases by up to 50%
- Neglect - Discards a random card at the start of each turn
- Anxiety - Disables the rest option at Safe Zones
- Rage / Harden - Monsters gain Fury or Resolve over time
Each penalty increases the Chaos Orb drop rate for that run, so tackling tougher Codexes is rewarded. When choosing a Codex, always pick penalties that have the least impact on your team composition. For example, if you're running a healer like Mika, the Anxiety penalty - which disables resting - barely affects you.
Seasonal Chaos in the Zero System
Sometimes, past Seasonal Chaos events reappear in the Zero System. These are worth prioritizing because they offer exclusive Save Data, event-only equipment, cards, and weekly achievement rewards on top of the usual Chaos Orb drops. Always challenge Seasonal Chaos while it's active.
Zero System Upgrades: How Chaos Orbs Work
The defining feature of the CZN Zero System is the upgrade system powered by Chaos Orbs - a special currency dropped during runs. You can still collect Chaos Orbs even if you escape a battle, so don't be afraid to retreat when a fight looks unwinnable.
CZN Chaos Orbs
Orbs are also dropped by Rare Species - identified by a purple flame icon on the map. These enemies hit harder and come with passive effects that buff themselves or debuff your team, but clearing them rewards extra Chaos Orbs at the end of the run.
Zero System upgrades are divided into three trees:
Accessibility Permission
Boosts core stats like Attack, increases Epiphany activation rates, and reduces Dellang Shop equipment costs. Best for improving general performance across runs.
CZN Zero System Upgrade - Accessibility Permission
Authority Expansion
Focuses on RNG manipulation: increases Divine Delegate encounter rates, adds free Training at Safe Zones, and unlocks the Meditation function that lets you reroll Epiphanies. Also stacks Defense and Health bonuses.
CZN Zero System Upgrade - Authority Expansion
Administrator Mode
The most powerful tree. Grants stronger Divine Representative benefits, removes Aether-Eater shields during events, reduces ally Stress after defeating Senectus in Invasion events, and most importantly - unlocks Signal Duplication, which changes random card copies into targeted combatant copies. This is one of the most impactful upgrades in the Zero System.
CZN Zero System Upgrade - Administrator Mode
Tip: Once you've unlocked all nodes in a tree, you can reset the skill tree without losing your unlocked progress. This lets you selectively invest in only the upgrades you need without wasting Chaos Orbs.
Zero System vs. Chaos Manifestation
| Chaos Manifestation | Zero System | |
| Difficulty | Normal | High (with restrictions) |
| Farming Element | None | Chaos Orb upgrades |
| Save Data Value | Standard | Higher |
| Rewards | Exploration only | Exploration + Chaos Matrix |
Once you can consistently clear the Zero System, there's no reason to go back to regular Chaos Manifestation. The Zero System is a direct upgrade in terms of rewards and long-term character progression.
Zero System Rewards
Every Zero System run contributes to your Chaos Matrix level, which is based on total accumulated Chaos Orbs - even the ones you've already spent on upgrades don't lower your level. Rewards scale with your level and include Crystals, Prism Lens, Premium Battle Memory, Premium Support Data, and more.
Additional rewards come from:
- Loot Certification Cards - Can yield Legendary Memory Fragments, which are rare drops exclusive to the Zero System
Loot Certification Cards
- Codex Records - Clear higher-difficulty Codexes to earn Crystal rewards
Codex Record - Crystal Reward
- Chaos Matrix - Seasonal milestone rewards that reset each period
Chaos Matrix
Tips for Zero System Beginners
- Start at the lowest Codex difficulty and work upward - you unlock harder difficulties as you complete runs
- Always spend your Chaos Orbs after each run; hoarding them delays your power spike
- Hunt Rare Species nodes on the map - the extra Chaos Orbs add up fast
- Train your characters to level 40+ and upgrade Potential before your first attempt
- Prioritize Signal Duplication in Administrator Mode once you're deep into the upgrade trees
Conclusion
The Chaos Zero Nightmare Zero System is a game mode worth mastering early - it outpaces regular Chaos Manifestation in every way, from Save Data quality to long-term upgrade potential. Once you're consistently clearing Codexes and stacking Chaos Orbs across all three upgrade trees, the mode practically runs itself. If you're gearing up for new Combatants or upcoming banners, LootBar offers up to 22% off on Chaos Zero Nightmare top up with 3-minute delivery and a 4.9/5 Trustpilot rating - great value for any Captain.
