Chaos Zero Nightmare (CZN)

Cassius Best Team and Build

Chaos Zero Nightmare Walkthrough Team

Last updated on: December 10, 2025 09:37 PM

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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
Related Guides

Best Cassius Build

Build Overview

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Summary			Best Team			Best Cards			Best Partner
Memory Fragment				Equipment				Playstyle

Character	Partner	Equipment
		Unexploded Plasma Bomb Regenerative Ribcage Revelation's of Futility
Memory Fragments and Stat Priorities
Healer's Journey Set Black Wing Set Cursed Corpse Set		1. HP % 2. HP 3. Crit Chance % 4. Crit Damage %
Cards and Epiphanies

Duplicate Priorities
Dice Trick > Devil Dice > Joker

Cassius's best build focuses on utilizing multiple copies of Dice Trick to generate quest cards after completing the Triple 0 quest to give the team card draw, morale buffs, healing and 0-cost attack cards. He can fit in any team as long as they can complete any of his quests multiple times in one turn due to the utility he brings. However, he pairs perfectly with Tressa and Mika because of how many 0-cost card they can generate.

He is best suited with the 2/2/2 set consisting of Black Wing, Cursed Corpse and Healer's Journey to boost his damage and reach the 700 HP requirement for his Potential 7. While his favored chaos zone is City of Mist to get his best equipment such as Unexploded Plasma Bomb for fixed damage every card exhaust. Regenerative Ribcage for more health stat and Revelations of Futility to generate a decent amount of shield every card exhaust.

Build Changelog

Date	Changes
12-11-2025	・Updated build overview ・Chaned best memory fragment from Tetra's Authority to Cursed Corpse ・Added Stat Priority ・Added alternative budget equipment
11-14-2025	・Added Triple-0 Cassius build combo ・Revised Cassius build page layout
10-25-2025	・Initial Cassius build release

Cassius Best Team

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Summary			Best Team			Best Cards			Best Partner
Memory Fragment				Equipment				Playstyle

Cassius Triple-0 Combo

Main-DPS	Support
Tressa	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 morale buffs alognside the Joker card which lets you choose a specific card to draw, opening up more opportunities for combos.

Cassius shines best when paired with characters that deals multi-hit attacks or uses multiple attack cards in one turn but lacks card draw and morale buffs. His ability to draw cards eases the setup for combinations, making him an ideal utility teammate for multiple builds.

Best Character Builds

Cassius Best Cards

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Summary			Best Team			Best Cards			Best Partner
Memory Fragment				Equipment				Playstyle

Card	Epiphany Effect
Pop Eyed Popper	AP Cost: 0 ・From 4 Quests, choose 1 to begin
Devil Dice	AP Cost: 0 ・Draw 1 ・80% Damage to all enemies equal to that card's cost
Shuffle	AP Cost: 0 Tags: Exhaust ・Select up to 5 cards from Discard to place on top of Draw Pile
Dice Trick	AP Cost: 2 ・On Quest completion, create 1 Quest Card(s)
Joker	AP Cost: 1 ・Select 1 card(s) from the Draw Pile to Draw

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
Source of Water	AP Cost: 0 ・Heal 150% ・1 AP ・1 Wave
Blessing of Waves	AP Cost: 1 Tags: Retain ・Heal 150% ・+30% Healing equal to number of AP ・1 Wave
Tactical Analysis	AP Cost: 0 Tags: Retain ・Heal 50% ・1 Wave ・For 2 turns, +50% Heal
Unsheathe Dagger	AP Cost: 0 ・Create 2 Shadow Dagger
Curse	AP Cost: 0 ・For 1 turn, when using Cards, 1 Agony to random enemies
Shadow Reload	AP Cost: 1 Tags: Initiation ・When Healed by a Skill Card, create 1 Shadow Dagger
Vital 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

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Summary			Best Team			Best Cards			Best Partner
Memory Fragment				Equipment				Playstyle

Partner	Details
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	A 4 star controller partner that boosts health and provides decent damage reduction through passive and ego skill.

Cassius Best Memory Fragments

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Summary			Best Team			Best Cards			Best Partner
Memory Fragment				Equipment				Playstyle

The optimal Memory Fragment combination for Cassius is basically Healer's Journey, Cursed Corpse, and Black Wing sets, granting an increase to Health, Damage, and Attack Stat.

This fits Cassius as he does not really need damage dealing sets to increase his damage aside from Cursed Corpse which multiplies his damage against enemies with agony, but it's important to increase his health to reach the 700 HP requirement for his Potential 7 which grants a stack of fortitude every quest completion.

List of All Memory Fragments

Stat Priority

Main Stats	Recommended Substats
Ideal: HP % Desire: HP % Imagination: HP %	・HP % ・HP ・Critical Chance % ・Critical Damage %

For both main stats and substats, he should aim for the HP stat as possible. He can add a little of critical chance and critical damage to enhance the damage of his cards but the only goal for his stats is to reach 700 HP and everything else is a bonus.

Cassius Best Equipment

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Summary			Best Team			Best Cards			Best Partner
Memory Fragment				Equipment				Playstyle

Weapon	Armor	Accessory
Unexploded Plasma Bomb	Regenerative Ribcage	Revelation'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

Alternative Budget Equipment

Weapon	Armor	Accessory
M85 Military Grenade	Brainwave-Blocking Helmet	Amorphous Cube

If you aren't able to get the best, you can settle for these equipment that some can only be found in Laboratory 0. M85 Military Grenade deals fixed damage every time he gets a buff from his upgrade or skill cards such as Straight or Dice Trick. Brainwave-Blocking Helmet gives a shield for each card drawn and Amorphous Cube gives a permanent +25% damage to all his cards.

Cassius Build Tips and Playstyle

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Summary			Best Team			Best Cards			Best Partner
Memory Fragment				Equipment				Playstyle

Only Choose Full House or Triple-0 Quest

Potential 7 Can Stack Infinitely

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 lets you get free card draws while Triple-0 enables insane combos only if you can use multiple 0-cost cards.

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:

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

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Cassius Best Team and Build

Best Cassius Build

Build Overview

Build Changelog

Cassius Best Team

Cassius Triple-0 Combo

Can Fit in Any Team Comp

Cassius Best Cards

Essential Team Cards and Epiphanies

Cassius Best Partner

Alternative Budget Partner

Cassius Best Memory Fragments

Stat Priority

Cassius Best Equipment

Alternative Budget Equipment

Cassius Build Tips and Playstyle

Only Choose Full House or Triple-0 Quest

Potential 7 Can Stack Infinitely

Tressa Daggers Triple-0 Quest Combo

Chaos Zero Nightmare (CZN) Related Guides

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