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Chaos Zero Nightmare Cassius Build Guide - Shuffle, Quests, Joker!

Jack Graham
|2025-10-27

Every Proto, as you are searching Cassius, you must have already obtain him. Cassius is 4-star Combatant belonging to the Peltion faction and wielding the Instinct attribute. He is a high-skill, support-minded Combatant in Chaos Zero Nightmare. Cassius stands out for his dynamic and demanding playstyle that revolves around card shuffle and task completion. This article is going to introduce everything about Cassius, helping you quickly understanding how to maximize his potentials.

Cassius Showcase

Cassius 

Cassius

 Rarity 

⭐⭐⭐⭐ (4-Star)

Class / Role

Controller / Instinct

Strengths

Draw Cards & Supplemental Damage

Weaknesses

Healing & Weak Survivability

Cassius Cards & Ego Skill Overview

If you feel like novel gameplay experience, you should know Cassius's cards and ego skill. Thanks to his intricate Quest System mechanics, he offers random powerful cards that deal damage, boost morale, or draw card, making Chaos Zero Nightmare more interesting. Below, you will have a quick understanding of Cassius's cards and ego skill. Optimize your strategy to enjoy randomity and infinite possibility.

Starting & Unique Cards

Pop Eyed Popper

Pop Eyed Popper

Start a random 1 out of 4 Quests. Every time you complete quest, you can get the chosen card. Beware, you are able to complete quests repeadedly, with no limit per turn.

Devil Dice

When playing Devil Dice, Cassius deals 160% damage to single target and draw 1 card. Drawing 1 card is highly valuable.

Shuffle

You can use shuffle once during combat. This card attached with Exhaust is powerful and critical. You can discard all cards and draw equivalent number of cards.

Joker

Joker

The only functional card in Chaos Zero Nightmare. You can choose 1 specific card from Draw Pile to unleash combos. So, you don't need to rely on chance.

Quest Card

Accept random quests by using Ego Skill or playing Pop Eyed Popper card. All quest cards are granted with Exhaust and Ephermeral, hence, they will move to Exhaust Pile after using or in the end of the turn. They get evolved once triggering Pop Eyed Popper's Epiphany.

Triple 0

Triple 1

Straight

Full House

Triple 0

Triple 1

Straight

Full House

Ego Skill - Death Trick

Create 2 Quest Card. For 1 turn, reduce 3 Morale to all enemies. Quest cards cost 0 AP with versatile ability. So, it creates more chances to reverse the situation.

Death Trick

How to Team Up Cassius

Cassius works best when paired with characters that rely on specific card combinations. By making full use of his unique card mechanics, he can quickly search for and trigger key cards that unlock powerful plays. If he starts Quest: Full House, the battle often becomes an easy win.However, compared to other supports, his healing ability is noticeably weak, whose effect is too minor to be reliable. If your team lacks strong shields or powerful DPS characters, it’s generally better to pick another support to maintain stability in battle.

Best Team Comps

Cassius Team (Explosive ST DMG)

Main DPS Support Sub-DPS/Support
Rin Cassius Nia/ Hugo
Rin Cassius Nia / Hugo

This team focuses on explosive ST damage outpu. Cassius allows allies to rotate low-AP damage card. Hugo pays attention to extra damage on target while applying crisp shield on team. Paired with Hugo, Rin can finish enemies quickly even though both Hugo and Rin have no AoE cards. To be important, the low AP cost of their cards enables easy Quests completion.

Nia can take the place of Hugo because she excels at boosting damage and healing, ensuring team's survival and overall damage output. Don't forget Cassius is also able to deal damage that is no weaker than Hugo with Nia's buffs.

Cassius Quest Loops

Cassius Team (Quest Loops) 

Renoa

Renoa (Main DPS)

Support Healer
Cassius Mika
Cassius Mika

Alternative: You can replace Renoa with any high burst damage Combatant with low AP cost cards.

This assemble revovles around Mika's AP generation, allowing team to play more cards. In ideal condition, the game becomes an easy play if Cassius draws the Quest: Fullhouse. Mika continuously generates AP, while Cassius draws cards. Renoa gets enough AP to generate Dirge Bullets and unleash Last-Ditch Assault (Chaos Zero Nightmare Renoa Build Guide provides more details to exploit her skills).

Nevertheless, this setup depends on luck. You can complete multiple Quest loops until there are no cards in Draw Pile if you are really lucky.

 

Training Tips

If you would like to spend less materials, Crystals or Rescue Anchors, you ought to pay attention to the details as follows. After our real tests, we extract the most useful and viable training strategies.

Potential

Unlock Potential 1 and 3-1 as soon as possible.

Potential 1

After entering Chaos, you acquire 1 random rare cards via Epiphany.

Potential 3-1

Cassius's Card and Wild Card have 30 chances of draw 1 extra card.

Manifest Ego

You merely need to manifest first ego. Joker card enables you to select from Draw Pile or Graveyard to draw.

Upgrade

Prioritize upgrading main DPS rather than Cassius. The squad relies on his unique mechanics that help main DPS finding critical cards. Invest resources on main DPS to unleash devastating powers.

Partner

Choose Nyx who improves team's damage after drawing card. Her ego skill is similar to Shuffle Card, so you can collect key card easily.

Nyx

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People Also Ask

Is Cassius Worth Using in Chaos Zero: Nightmare?

Cassius is definitely worth considering if your team relies on consistent card draws or fast deck cycling. His ability to locate key cards early can change the tide of battle.

Is Cassius Top-tier Support in Chaos Zero: Nightmare?

Yes, of course. His unique mechanics define his specialty and unparalleled potentials.

Who is Chaos Zero Nightmare Developer?

Chaos Zero Nightmare is developed by Smilegate. The game is also developed by the team behind Epic Seven.

Conclusion

Cassius, affiliated to Peltion faction and Instinct attribute, is 4-star Combatant who excels at locating key cards. To max out his powers, playing Chaos Zero Nightmare on PC with LDPlayer helps you farming and grinding faster with Multi-instances & Sync and One-click Macro.

More from Chaos Zero Nightmare

Chaos Zero Nightmare Beginner Guide

Chaos Zero Nightmare Reroll Guide

Chaos Zero Nightmare Partner Tier List

Jack Graham
|
Engineer

Arts and Literature Enthusiast - Engineer - 26 years old. Passionate about MMO&RPG games and impressed by their elaborate arts and vast world view. I love studying background stories and sharing these immersive gameplay experience for all players. It's a kind of communication with virtual world, not just an expression of emotion.