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Zenless Zone Zero (ZZZ)
Deadly Assault Guide and Reset
☆ New: Tier List Maker & Co-Op Board!
★ Upcoming: Version 2.6, Sunna, & Aria!
☆ 2.5 Debut: Ye Shunguang & Zhao
★ 2.5 Rerun: Alice, Soldier 0 Anby, & Astra
☆ Tier Lists: Agents | W-Engines | Bangboos | Teams
★ Redeem Codes for free Polychromes!
Deadly Assault is an endgame battle mode in Zenless Zone Zero (ZZZ) where Proxies will face 3 bosses. Check out when Deadly Assault resets, how to beat each stage, and rewards here!
| Endgame Guides | |
|---|---|
 Shiyu Defense |
 Deadly Assault |
List of Contents
Deadly Assault Latest News
New Boss and Squad Building Guide
It was announced in the Version 2.5 Livestream that a new boss will be introduced in the Deadly Assault lineup in Version 2.5! Additionally, the new Squad Building Guide will be made available for Proxies to peruse.
The Squad Building Guide will give Proxies a preview of the teams used by other Proxies against a particular boss, which can be used as inspiration for their own team lineups!
Deadly Assault Reset
Deadly Assault Reset Calendar
Deadly Assault Stages For This Phase
| Deadly Assault Stages and Weakness | ||
|---|---|---|
 Primordial Nightmare |
 Miasmic Fiend Unfathomable |
 Wandering Hunter |
|
|
 
|
Click on the boss icon to jump to a stage guide!
These are all the current enemies in the January 2, 2026 update for Deadly Assault.
All Bosses in 2.5
| Phase | Bosses | ||
|---|---|---|---|
| 1 |  The Defiler |
 Notorious - Marionette |
 Miasma Priest |
| 2 | Primordial Nightmare |
 Unknown Corruption Complex |
Wandering Hunter |
Deadly Assault Buffs For This Phase
| Buff | Deadly Assault Buff Effect |
|---|---|
 Focus Energy |
• Agent ATK increases by 16%, and enemy Stun DMG Multiplier increases by 30%. • When in Ether Veil, Agent attacks that hit enemies ignore 10% of Physical RES and 15% of DEF. |
 Dream Delusion |
• Agent Anomaly Proficiency increases by 40. • When inflicting Attribute Anomaly on enemies, their DEF is reduced by 10%, and Agent Anomaly DMG against them increases by 20% for 10 seconds. Repeated triggers reset the duration. |
 Sonata |
• Agent Decibel Generation Rate increases by 20%. • Ultimates and EX Special Attacks ignore 20% of DMG RES on hit. After an Ultimate hits enemies, Agent Ultimate and EX Special Attack DMG increase by 50% for 30s, repeated triggers reset the duration. |
These are the current buffs available for this season of Deadly Assault. It would be wise to familiarize yourself with them, as they can help you earn large Performance Points, making it easier to get 3-star ratings.
It can also help you better understand the boss you'll be up against.
Deadly Assault Reset
| Deadly Assault Reset Date and Countdown |
|---|
| January 16, 2026 |
Deadly Assault usually resets every other Friday. This resets all your progress, allowing you to collect the rewards again upon completion.
Season resets will also change the boss lineup and buffs available to you. For the current version, the next phase of Deadly Assault will reset on January 16, 2026.
How to Unlock Deadly Assault
Reach Inter-Knot Level 40 and Unlock Shiyu Defense
Deadly Assault can be unlocked after reaching Inter-Knot Level 40 and unlocking the Shiyu Defense game mode. Once done, clear the Deadly Situation commission to access the game mode.
Primordial Nightmare Stage Guide
Primordial Nightmare Stage Details
| Stage Boss Information | |
|---|---|
|
Primordial Nightmare
|
|
| Weaknesses | Resistances |
| Enemy Details | |
|
• Suitable for Agents with Attack specialty. • Boss Anomaly DMG taken is reduced by 30%. When switching from Miasmic Shield state to normal state, or from normal state to Miasmic Shield state, Agent CRIT DMG against them is increased by 20%. This effect can stack up to 3 times and resets when the boss recovers from Stun. • Triggering Miasmic Shield Purification grants 1,000 Performance Points. During the Control Skill, each successful counter against the Boss's attacks grants 500 Performance Points. Performing a Shutdown on the Boss's Control Skill grants 2,000 Performance Points. Maximum obtainable Performance Points: 5,000. |
|
Primordial Nightmare Best Teams and Buffs
| Best Teams & Bangboo | Buff |
|---|---|
|
Focus Energy |
|
Sonata |
|
Sonata |
Characters selected in one stage cannot be used in other stages. Save characters for different stages and form your teams carefully.
How to Beat Primordial Nightmare
Perform Defensive Assists and Dodge Counters
During the Control Skill, successfully perform Defensive Assists and Dodge Counters to gain Performance Points. Shutting down the Primordial Nightmare's Control Skill will also net you 2,000 Performance Points.
Miasmic Fiend - Unfathomable Stage Guide
Miasmic Fiend - Unfathomable Stage Details
| Stage Boss Information | |
|---|---|
|
Unfathomable
|
|
| Weaknesses | Resistances |
| Enemy Details | |
|
• Suitable for Agents with Anomaly specialty.
• When Miasmic Fiend is affected by Attribute Anomaly, it takes 8% bonus Anomaly DMG from Agents, stacking up to 6 times; activating Miasmic Shield clears all stacks, with each stack increasing the reduction efficiency of Miasmic Shield by 2.5%. • When Agents bait Miasmic Fiend's ground attack into detonating at least 5 Miasma Pools at once and avoid being hit by the attack and pool explosions, they will earn 1,700 Performance Points, up to a maximum of 5,000. |
|
Miasmic Fiend - Unfathomable Best Teams and Buffs
| Best Teams & Bangboo | Buff |
|---|---|
|
Dream Delusion |
|
Dream Delusion |
|
Dream Delusion |
Characters selected in one stage cannot be used in other stages. Save characters for different stages and form your teams carefully.
How to Beat Miasmic Fiend - Unfathomable
Avoid Getting Hit by Miasma Pools
When the Miasmic Fiend - Unfathomable jumps and tries to hone Miasmic Pools on you, you must dodge it before it detonates and causes immense damage to your active character.
To do this, observe the red highlight on the floor, where there will be two circles: one for the entire circumference of the attack and the other to indicate when it will detonate.
When it's near the edge of the outer circle, dodge! Doing so five times will grant 1,700 Performance Points up to 5,000!
Keep an Eye on Continuous Attacks
Similar to the Miasma Priest, the Miasmic Fiend - Unfathomable is capable of successive attack cues that you must either use Perfect Assist or Dodge Counters. Otherwise, it will deal a significant amount of damage.
Wandering Hunter Stage Guide
Wandering Hunter Stage Details
| Stage Boss Information | |
|---|---|
|
Wandering Hunter
|
|
| Weaknesses | Resistance |
| Enemy Details | |
|
• Suitable for Agents with Rupture specialty. • Wandering Hunter's Base DEF increases by 40% in Miasmic Field; when an Agent hits Wandering Hunter with Assist Follow-Up or Dodge Counter, 1 stack of Wavering is applied. Wavering can stack up to 5 times and lasts 15 seconds. Repeated triggers reset the duration. • When an Agent's attacks hit Wandering Hunter, for each stack of Wavering, the Agent's Sheer DMG is increased by 7%. • During the hide-and-seek phase, using Perception Technique to break Drowned Ideal Lucia's true form will grant 3,000 Performance Points; Exposing his true form and activating Defensive Assist or hitting Wandering Hunter with an Assist Follow-Up will grant 2,000 Performance Points, up to a maximum of 5,000 Performance Points can be obtained. |
|
Wandering Hunter Best Teams and Buffs
| Best Teams & Bangboo | Buff |
|---|---|
|
Sonata |
|
Sonata |
|
Sonata |
|
Sonata |
Characters selected in one stage cannot be used in other stages. Save characters for different stages and form your teams carefully.
How to Beat Wandering Hunter
Perform Assists and Dodge
The best way to defeat the Wandering Hunter is to keep an eye on its attack cues to execute an assist or dodge counter, as you can gain about 5,000 Performance Points using that strategy.
Use Perception Technique
The Wandering Hunter will switch to its hide-and-seek phase, so you must use the Perception Technique to reveal the true form, which also grants an additional 3,000 Performance Points. Once revealed, follow it up with more assists and an all-out attack.
How to Play Deadly Assault
Deadly Assault Guide
Use Appropriate Agents for Each Battle
One thing to note when braving Deadly Assault is that previously used Agents and Bangboo cannot be used again in the next battle. Each and every battle will require unique teams.
In light of this, it would be wise to identify each boss's weaknesses and resistance before taking on the challenge. That way, you can formulate parties accordingly.
Take Advantage of Stage Effects and Buffs
Each stage in Deadly Assault will have stage effects that may make the battle a little more challenging than usual. Additionally, they will provide gameplay-based buffs, such as increasing the Anomaly Buildup Rate.
With this in mind, Proxies will be able to better formulate parties based on the buffs and effects each stage provides. Be sure to review the stage buffs and effects and strategize accordingly!
Aim for a High Score for Higher Ratings
In Deadly Assault, your performance rating will be based on how many objectives you can complete during battle. Completing an objective will increase your overall score.
Your scores will be determined by two things: Damage Score, which is determined by dealing a certain amount of DMG, and Mechanics Score, which is determined by performance such as using Perfect Assists and Chain Attacks.
Reset Your Lineup if Necessary
If you find that certain characters are necessary for other battles, you may reset your lineup to make them available for other stages even after using them in one. Keep in mind that this will reset your records.
However, this will not reset your progress. If you've already acquired three stars in one battle and you choose to reset your lineup, the rewards you can acquire for getting three stars will still be available to get!
Deadly Assault Rewards
Total Deadly Assault Rewards
| Total Deadly Assault Rewards |
|---|
 Polychrome
x300 Investigation Merits x720 Denny
x25,000 |
Proxies will only have to obtain 6 stars to get all the Polychromes for Deadly Assault. That means each stage will only require you to achieve 2 stars if you're having a difficult time getting a 3-star.
Deadly Assault Rewards Per Star
| Objective | Rewards |
|---|---|
| 1-Star | Polychrome
x50 Investigation Merits x80 Denny
x25,000 |
| 2-Star | Polychrome
x50 Investigation Merits x80 Denny
x25,000 |
| 3-Star | Polychrome
x50 Investigation Merits x80 Denny
x25,000 |
| 4-Star | Polychrome
x50 Investigation Merits x80 Denny
x25,000 |
| 5-Star | Polychrome
x50 Investigation Merits x80 Denny
x25,000 |
| 6-Star | Polychrome
x50 Investigation Merits x80 Denny
x25,000 |
| 7-Star | Investigation Merits x80 Denny
x25,000 |
| 8-Star | Investigation Merits x80 Denny
x25,000 |
| 9-Star | Investigation Merits x80 Denny
x25,000 |
Deadly Assault Achievements
| Title | How to Get and Rewards |
|---|---|
Raid Operation |
Obtain 3 stars in Deadly Assault Polychrome
x5 |
Blitz Breaker |
Obtain 7 stars in Deadly Assault Polychrome
x20 Blitz Operation Expert |
| Sweep the Battlefield |
Obtain 9 stars in Deadly Assault Polychrome
x20 Deadly Assault: Line Breaker |
Zenless Zone Zero Related Guides
Guides by Category
Zenless Zone Zero Tips and Tricks
Comment
23 
Anonymous 21 days
Anonymous 21 daysAstra, Evelyn and Dialyn can clear without problem the new boss with 3* also Sanby, Orphie and Trigger can clear the Lucia boss too.
Author
Deadly Assault Guide and Reset
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