Rei Best Guide: Skill Analysis, Build and Teams | Chaos Zero Nightmare

In the world of Chaos Zero Nightmare, Rei stands out as a tactical powerhouse—a 4-star Controller-class character whose expertise in buff management, card synergy, and adaptive support makes her an indispensable asset for any squad aiming to dominate the battlefield. 
Now, let’s dive into the key details that make her a must-have addition to your team, from her core mechanics to optimal builds, and discover how to unlock her full potential!

Rei Overview

Rei is a 4-star character categorized under the Controller class and possessing the Void attribute, and they are a member of the Terrascion [SS Edenity] faction.

Core Gameplay: Rei's core gameplay focuses on card synergy, buff management, and resource circulation. Her cards and upgrades make her a "tactical buff supporter", balancing team damage enhancement with minor sub-DPS output.

Combat Style: Rei's combat style is defined by adaptive support – she prioritizes targeted buffs to amplify allies’ damage while managing resources smoothly, making her a flexible fit for various team compositions.

 

Rei Skill & Card Anlysis

Dark Blade (Attack) : 100% Damage.

Material Regeneration (Skill): Heal 100%.

Strike of Darkness (Attack): 100% Damage.For 1 turn, +100% Basic attack card Damage

Resonating Darkness (Upgrade): +40% Damage of cards with cost 1.

Snack Time (Skill): Select 1 card(s) from hand to Exhaust. Heal 100%. Draw 1.​

Dark Condensation (Skill): Choose 1 Attack Card(s) in hand, +100% Damage for 1 turn.​

Predator's Blade(Attack): 250% Damage. For 1 turn 2 Morale.

Final Shadow(Ego Skill): 300% Damage. +1 AP.

 

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Rei Pros & Cons

Pros

Versatile Buff Utility: Can provide both multiplicative and additive damage buffs, adapting to various main DPS playstyles .

Efficient Resource Management: Leverages 0-cost cards and “Exhaust” mechanics to maintain smooth deck circulation, avoiding card congestion and ensuring consistent support.

Hybrid Role Flexibility: Acts as a “tactical supporter + sub-DPS”, contributing minor damage while prioritizing team enhancement, making her valuable in both short and long battles.

Cons

Roguelike Dependence: Full potential relies on Epiphany Cards, which can be inconsistent and limit performance in standard gameplay.

Niche Synergy: Best suited for teams built around attack card damage; less impactful in squads focused on skill-based or high-cost burst damage.

Stat Threshold Requirement: ATK-driven bonuses need investment to reach, making her less effective early in progression without stat-focused builds.

 

Team Compositions

Main DPS	Support	Support
Rin	Mika	Rei

Rei’s optimal team composition features Rin as the primary damage dealer and Milka as the support, allowing Rei to fulfill her role as an attack buffer. This setup enables her to maximize their damage output—either by increasing the damage of a specific card or securing the Morale buff for the entire team.

 

Memory Fragments

As a tactical support in the team, one of Rei's major strengths is that beyond the core card combinations, the gear set selection is relatively flexible, and you can just match them as needed to unleash her core value in buffing and resource management.

Tetra's Authority Set	+12% Defense
Seth's Scarab Set	Increase the damage, Shield and Healing of Basic Cards by 20%
Healer's Journey Set	+12% Max HP

 

Stat Priority

Main Stats: ATK%＞Void Damge%＞ATK%

Sub Stats: ATK%, ATK, Defense, Health%

 

Conclusion

In conclusion, Rei is a versatile and valuable tactical supporter in Chaos Zero Nightmare, excelling in buffing, resource management, and team synergy.

Don’t miss out on unleashing her full potential—head to LDShop now to top up Chaos Zero Nightmare and elevate your gaming experience with seamless in-game progress and exclusive rewards. Act fast and dominate the battlefield with Rei by your side!