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Chaos Zero Nightmare (CZN)

Cassius Best Team and Build

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Chaos Zero Nightmare - Cassius Build Top Banner

This is a guide for the best teams and loadout for Cassius in Chaos Zero Nightmare (CZN). Learn which combatants are best to pair with Cassius, as well as recommended cards, partners, and equipment.

Cassius Guides
Team and Build Cards and Materials

List of Contents

Best Cassius Build

Build Overview

Click on a Link to Jump to a Section!
Summary Summary Best Team Best Team Best Cards Best Cards Best Partner Best Partner
Memory FragmentMemory Fragment Best EquipmentEquipment PlaystylePlaystyle
Party List
Cassius Cassius Tressa Tressa Mika Mika
CZN Build - Pro Can deal high single-target damage in one turn
CZN Build - Pro Easy to build
CZN Build - Con Lacks AoE damage

Cassius best team is Tressa and Mika. Tressa's goal is to create as many Shadow Daggers as possible thanks to Mika who provides healing and AP recovery for the team. Cassius' job is to collect as many Triple 0 as possible after playing a lot of Shadow Daggers then playing all the Triple 0 cards to deal a lot of single-target damage.

Build Changelog

Date Changes
11-14-2025 ・Added Triple-0 Cassius build combo
・Revised Cassius build page layout
10-25-2025 ・Initial Cassius build release

Cassius Best Team

Click on a Link to Jump to a Section!
Summary Summary Best Team Best Team Best Cards Best Cards Best Partner Best Partner
Memory FragmentMemory Fragment Best EquipmentEquipment PlaystylePlaystyle

Cassius Triple-0 Combo

Main-DPS Support
Tressa Tressa Mika Mika

Cassius best cards for this build must have the Dice Trick epiphany that creates a random quest card for each quest completion. He also need to activate Triple 0 and getting the option to choose a quest is also a viable epiphany for Pop Eyed Popper. He also needs a lot of his cards to cost 0.

Can Fit in Any Team Comp

Cassius has the ability to draw cards and lets you choose a specific card from the draw pile, opening up more opportunities for combos.

Cassius shines best when paired with characters that deal a ton of damage. His ability to draw cards eases the setup for combinations, making him an ideal utility teammate for multiple builds.

Here are some of the team composition that makes well use of Cassius ability:

Character Build Details
Haru Haru
Team: Mika Cassius
Haru's best team consists of Mika and Cassius, who support her by providing AP and cycling her cards so she can use Anchor Shot as often as possible. This team is focused on dealing as much damage as possible in the shortest amount of time, while maintaining decent survivability.
Renoa Renoa
Team: Cassius Rei
Renoa's team allows her to keep on stacking Dirge Bulelts from her hand or her discard pile to use with her Last-Ditch Assault or Black Thorn. This team composition is ideal for dealing high single-target damage, but can also work for normal enemy groups.
Rin Rin
Team: Orlea Cassius
Rin's team makes full use of Orlea's various Skill Cards and Cassius' target draws to easily activate Dark Cloud Stance and deal huge single-target damage throughout the fight.
Yuki Yuki
Team: Veronica Cassius
Yuki excels in dealing high AoE Order Damage, but needs characters that help her draw cards and cycle the deck fast to play around her Inspiration mechanics. Veronica and Cassius are the best team for Yuki as both excel in providing draws while dealing significant damage and survivability.

List of All Characters

Cassius Best Cards

Click on a Link to Jump to a Section!
Summary Summary Best Team Best Team Best Cards Best Cards Best Partner Best Partner
Memory FragmentMemory Fragment Best EquipmentEquipment PlaystylePlaystyle
Card Epiphany Effect
Wiki - Pop Eyed PopperPop Eyed Popper AP Cost: 0
・From 4 Quests, choose 1 to begin
Wiki - Devil DiceDevil Dice AP Cost: 0
・Draw 1
・80% Damage to all enemies equal to that card's cost
Wiki - ShuffleShuffle AP Cost: 0
Tags: Exhaust
・Select up to 5 cards from Discard to place on top of Draw Pile
Wiki - Dice TrickDice Trick AP Cost: 2
・On Quest completion, create 1 Quest Card(s)
Wiki - JokerJoker AP Cost: 1
・Select 1 card(s) from the Draw Pile to Draw
Wiki - Quest: Triple 0Quest: Triple 0 AP Cost: 0
・When using 3 cards with cost 0, create Triple 0

Cassius best cards revolves around the Triple 0 Quest and relying on RNG to get the Full House Card for free card draw using only 0-cost cards. Reminder to at least have both Pop Eyed Popper and Dice Trick online before going to turn 3, preferably you want both activated on turn 1 or turn 2 before using all the 0-cost cards you have.

Essential Team Cards and Epiphanies

Card Epiphany Effect
Wiki - Source of WaterSource of Water AP Cost: 0
・Heal 150%
・1 AP
・1 Wave
Wiki - Blessing of WavesBlessing of Waves AP Cost: 1
Tags: Retain
・Heal 150%
・+30% Healing equal to number of AP
・1 Wave
Wiki - Tactical AnalysisTactical Analysis AP Cost: 0
Tags: Retain
・Heal 50%
・1 Wave
・For 2 turns, +50% Heal
Wiki - Unsheathe DaggerUnsheathe Dagger AP Cost: 0
・Create 2 Shadow Dagger
Wiki - CurseCurse AP Cost: 0
・For 1 turn, when using Cards, 1 Agony to random enemies
Wiki - Shadow ReloadShadow Reload AP Cost: 1
Tags: Initiation
・When Healed by a Skill Card, create 1 Shadow Dagger
Wiki - Vital AttackVital Attack AP Cost: 2
・150% x 3 Damage
・+10% Damage per target's Agony

Mika wants as much healing cards as possible and make it cheap to play. Tressa on the other hand needs the epiphany for Shadow Reload where it creates a Shadow Dagger when healed. If possible, copy it so you will get two daggers per heal.

Cassius Best Partner

Click on a Link to Jump to a Section!
Summary Summary Best Team Best Team Best Cards Best Cards Best Partner Best Partner
Memory FragmentMemory Fragment Best EquipmentEquipment PlaystylePlaystyle
Partner Details
Nyx Nyx Passive Effect:
Errante Hurricane - The assigned combatant's HP and healing are increased by 8%. When the assigned combatant Draws for the first time each turn using an ability, +8% Damage dealt by allies for 1 turn.
Ego Skill:
Resonance - Discard up to 3 cards, then Draw +1 cards equal to the number discarded

The best partner for Cassius is Nyx as her passive allows Cassius's teammates to deal more damage when Cassius draws cards. On top of that her ego skill also synergizes with Cassius's card draws. When played as a team, this partner setup allows you to narrow down the RNG of your card pulls.

List of All Partners

Alternative Budget Partner

Partner Explanation
Arwen Arwen A 4 star controller partner that boosts health and provides decent damage reduction through passive and ego skill.
Yvonne Yvonne A 3 star controller partner that boosts that defense and provide healing when not attacking or through ego skill.

Cassius Best Memory Fragments

Click on a Link to Jump to a Section!
Summary Summary Best Team Best Team Best Cards Best Cards Best Partner Best Partner
Memory FragmentMemory Fragment Best EquipmentEquipment PlaystylePlaystyle
Wiki - HealerHealer's Journey Set Wiki - TetraTetra's Authority Set Wiki - Black Wing SetBlack Wing Set

The optimal Memory Fragment combination for Cassius is basically Healer's Journey, Tetra's Authority, and Black Wing sets, granting increases to Health, Defense, and Attacks. This fits Cassius as he does not really need complex cards to increase his damage, but it's important to increase his defenses to last longer in fights.

For your main stat and substar priority, it's best to focus on Defense to increase Cassius' survivability to keep him longer in fights. Cassius is an integral part of teams as he can make damage setups easier for Main DPS characters.

List of All Memory Fragments

Cassius Best Equipment

Click on a Link to Jump to a Section!
Summary Summary Best Team Best Team Best Cards Best Cards Best Partner Best Partner
Memory FragmentMemory Fragment Best EquipmentEquipment PlaystylePlaystyle
Weapon Armor Accessory
Wiki - Unexploded Plasma BombUnexploded Plasma Bomb Wiki - Regenerative RibcageRegenerative Ribcage Wiki - RevelationRevelation's of Futility

Every variation of Cassius needs these equipments. Unexploded Plasma Bomb to deal fixed damage after using his quest cards. Regenerative Ribcage to increase his health. Revelation's of Futility to gain shield when using his quest cards. These combination of equipments makes him a sub-DPS and a competent support at the same time.

Do note that all of these can only be obtained in The City of Mist chaos zone.

List of All Equipment

Cassius Build Tips and Playstyle

Click on a Link to Jump to a Section!
Summary Summary Best Team Best Team Best Cards Best Cards Best Partner Best Partner
Memory FragmentMemory Fragment Best EquipmentEquipment PlaystylePlaystyle
Check icon Only Choose Full House or Triple-0 Quest
Check icon Potential 7 Can Stack Infinitely
Check icon Tressa Daggers Triple-0 Quest Combo

Only Choose Full House or Triple-0 Quest

Chaos Zero Nightmare - Quest Cards
Cassius' main gimmick is the Quest Cards that lets him deal damage that stacks, draw card, heal or buff your damage and defense. These two are the best quest to take because Full House is generally best in most cases while Triple-0 enables insane combos.

Potential 7 Can Stack Infinitely

Cassius Potential 7 gives 1 Morale for 1 turn after completing a quest. He can complete a quest multiple times in one turn and you can get multiple stacks of morale in a single turn if played right.

Tressa Daggers Triple-0 Quest Combo

This combo lets you create a lot of Shadow Daggers and Triple-0's in one turn. Once enabled, every turn you can deal a lot of damage when played right but you need fulfill these requirements first:

  • Copied at least two Shadow Reload that gives Tressa a Shadow Dagger when healed.
  • Selected the Dice Trick epiphany that creates a random quest card after completing a quest.
  • You need to have the Triple 0 quest activated.
  • Made all of Mika's cards as cheap as possible.

Once done, all you need to do is activate the cards mentioned above and do these following steps:

  1. Use a healing card to create at least two Shadow Daggers then use immediately.
  2. Once quest is complete, do not use Triple 0 and instead play the other three quest cards.
  3. Check your hand to see if it goes beyond the hand size limit, use some Triple 0 to free some space.
  4. Go back to step 1 until there are no more cards to play.
  5. Unleash all the Triple 0 cards to deal massive damage.

Chaos Zero Nightmare (CZN) Related Guides

Best Builds

Best Character Builds

5 Star Character Builds

Wiki - HaruHaru Wiki - HugoHugo Wiki - KayronKayron
Wiki - KhalipeKhalipe Wiki - LukeLuke Wiki - MagnaMagna
Wiki - Mei LinMei Lin Wiki - OrleaOrlea Wiki - RenoaRenoa
Wiki - RinRin Wiki - VeronicaVeronica Wiki - YukiYuki

4 Star Character Builds

Wiki - AmirAmir Wiki - BerylBeryl Wiki - CassiusCassius
Wiki - LucasLucas Wiki - MaribellMaribell Wiki - MikaMika
Wiki - NiaNia Wiki - OwenOwen Wiki - ReiRei
Wiki - SelenaSelena Wiki - TressaTressa

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