If you've reached Captain Level 25 in Chaos Zero Nightmare, you've likely unlocked Memory Fragments, one of the key systems in the game. They're what turn a good agent into a top-tier one, shaping your end-game strategies.
They do more than just boost stats; they help you create specific playstyles, fine-tune builds, and tackle the toughest challenges. In this guide for Chaos Zero Nightmare, we'll cover all you need to know about Memory Fragments.

What are Memory Fragments
Memory Fragments are set-based equipment pieces exclusive to your Combatants. They provide stat boosts and special effects when equipped in sets of 2 or 4. Each set focuses on a specific battle style, from heavy crit damage builds to healing or defense-oriented bonuses.
You can think of Memory Fragments as the next layer of character progression after traditional gear. Each Combatant can equip up to six Memory Fragments, one for each slot:
- Shock
- Suppression
- Denial
- Ideal
- Desire
- Imagination
Each slot has a main stat and several substats, and while the main stat is guaranteed, substats are randomly rolled, meaning no two Fragments are ever truly identical. This randomness makes farming and upgrading fragments an essential part of your long-term grind.
How to unlock Memory Fragments

To get started with Memory Fragments, you need to reach Captain Level 25. At that point, you'll unlock the Simulation: Memory Fragments mode in the Simulation menu. This lets you farm specific fragment sets.
Each area in the simulation targets certain sets, allowing you to farm what fits your team best. Runs cost 60 Aether each, and higher difficulties improve the odds for rarer fragments.
The difficulty levels range from 1 to 10, with higher levels unlocking better drops and even Particles of Memory, an advanced upgrade material used later for crafting. Also, the Crafting system unlocks at Captain Level 40, so by the time you hit Level 40, you’ll be able to both farm and craft the fragments you need, giving you full control over your builds.
How to upgrade Memory Fragments

Upgrading is crucial to getting the most out of your Memory Fragments. You can enhance each one to improve its main and substats, helping your characters reach peak performance. It looks straightforward, but there's a lot of strategy involved that can define your late-game setup.
Upgrades use Particles of Memory and other special materials, so managing resources is important. Each upgrade boosts the main stat, giving reliable increases to things like Attack, Defense, or HP. But the real value comes when you unlock substats, which are extra bonuses like crit chance, damage over time, ego recovery, or defense percentages.
Once all substats are unlocked, further upgrades randomly improve one of them. This makes it exciting and unpredictable, like a bet where you could get the ideal crit damage for your damage dealer or something defensive when you wanted offense.
How to get Memory Fragments in Chaos Zero Nightmare

There are a few ways to gather and improve your Memory Fragments. Here's the breakdown:
Clear Simulation: Memory Fragments
This mode is the main and most dependable method to farm Memory Fragments in Chaos Zero Nightmare. Each stage drops particular set pieces based on its theme, so pick the right one for efficient farming.
Your chosen difficulty affects drop rates and rarity. Higher levels give better stuff, like rare and legendary fragments, but each run uses 60 Aether, so watch your energy.
Plan farms around regen times or use restorers during events or double drops. Regular runs will help you build solid sets for your key combatants.
Craft using Particles of Memory
At Captain Level 40, you can craft Memory Fragments yourself. Great for getting exactly what you need without depending on luck. Choose a specific part for 100 Particles of Memory, or random for 50.
It's especially useful for Imagination, Desire, and Ideal slots, where you can pick the main stat with Multidimensional Alignment Materials. This lets you customize builds and avoid waste.
Dismantle Old or Unused Fragments
When your inventory gets full of extras or weak fragments, dismantling them is key for managing resources. It gives you materials to upgrade better ones. Keeping this up ensures a constant supply and keeps your gear current with the game's challenges.




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