Most players grind Deadly Assault for stars they are never paid for. The mode goes to nine stars, the reward track stops paying Polychrome at six, and nothing in the interface tells you that until you have already burned an evening on it.
Quick answer: Deadly Assault is a permanent endgame mode added in Version 1.4. You fight three enhanced bosses, three minutes each, scored on points rather than clear time, with up to three stars per stage for a maximum of nine. It resets every two weeks on Friday, alternating with Shiyu Defense: Critical Node — the next reset is 11 September 2026. Per stage you need roughly 6,000 points for one star, 14,000 for two and 20,000 for three. The critical detail: Polychrome only pays out on your first six stars, 50 each, capping at 300. Stars seven through nine pay Denny and Investigation Merits, not pulls. Teams lock per boss, so you need three distinct squads.
Article status: verified 10 September 2026 against HoYoverse's official Version 3.2 materials plus two independently maintained third-party mode trackers, and cross-checked against player reports on the official subreddit. The current boss lineup below is dated because it rotates out tomorrow. Nothing here comes from a leak or a test build, and where something is genuinely unconfirmed this article says so instead of guessing.
What is Deadly Assault in Zenless Zone Zero?
Deadly Assault is the boss-rush endgame of Zenless Zone Zero. It arrived in Version 1.4 as a permanent mode and has run on a rotation ever since, sitting alongside Shiyu Defense and Hollow Zero as the third pillar of endgame content.
The format is deliberately narrow. Three stages, one enhanced boss each, three minutes on the clock. These are campaign bosses rebuilt for the mode — extra mechanics, higher stats, and roughly 30 life bars at around Level 70 depending on the rotation. You are not trying to kill them. Most of the time you cannot.
That is the part that trips up players coming from Shiyu Defense. Deadly Assault does not score you on the kill; it scores you on damage and mechanics inside the timer. A run where you never drop the boss can easily out-score a run where you did, because the points come from the numbers you put out and the mechanic windows you convert. Three minutes is the whole budget, and the mode ends whether or not the health bar does.
How do you unlock Deadly Assault?
Three requirements, in order:
- Reach Inter-Knot Level 40. This is the gate most new accounts hit first and it is not skippable.
- Unlock Shiyu Defense. Deadly Assault sits behind it in the progression chain.
- Complete the "Deadly Situation" commission at Scott's Outpost, which formally opens the mode.
Once it is open, it stays open. There is no seasonal re-unlock — only the rotation refreshes.
When does Deadly Assault reset?
Every two weeks, on a Friday, at 04:00 server time. The reset wipes your stage progress, rotates the boss lineup, and swaps the buff cards available to you.
It alternates with Shiyu Defense: Critical Node, which is the scheduling detail worth internalising. The two modes do not both refresh on the same day. In practice you get a rolling two-week cadence where one endgame mode opens as the other closes, so there is almost always something on the clock.
The current stages have been live since 28 August 2026 and close today, 10 September 2026. The next reset lands on 11 September 2026. If you are reading this on the day, you have one evening left to bank stars on the current lineup before it is gone — and if you are reading it after, the boss list below has already rotated.
That cadence also means the mode rewards a habit, not a grind: nine stars is one or two sessions for a built account.
How does ZZZ Deadly Assault scoring work?
Points, not time. Each stage awards up to three stars against fixed score thresholds:
| Stars | Approximate score needed | What it means in practice |
|---|---|---|
| 1 star | 6,000 points | A single reasonably built team can clear this |
| 2 stars | 14,000 points | Requires converting most mechanic windows |
| 3 stars | 20,000 points | Needs correct attribute matching plus clean parries or dodges |
Across three stages that is a maximum of nine stars.
Points come from three places, and the third is where most of the gap between a 12,000 run and a 20,000 run lives:
- Raw damage dealt to the boss inside the timer.
- Daze and stun conversion — landing damage in the stunned window is worth far more than landing it outside one.
- Mechanic-specific point awards. Each boss hands out large flat point bonuses for correctly answering its signature mechanic. On recent rotations that has meant 300 points for a Perfect Dodge or Perfect Assist, 1,000 points for a parry, an extra 1,000 for a chained parry, and up to 1,500 for breaking a boss's protective state — with each mechanic capped at around 5,000 points per run so you cannot farm one interaction indefinitely.
The practical read: if your score is stalling in the low teens, the fix is almost never more damage. It is learning the two or three windows the boss telegraphs and taking all of them.
Each stage also offers a buff card choice before the fight. These change with every rotation and are usually built around the boss you are about to face — a damage-amplification buff, an anomaly or Daze buff, and a Chain Attack buff are the common shapes. They are free score. Skipping the selection screen is throwing away a couple of thousand points.
What rewards does Deadly Assault give, and why do they stop at six stars?
This is the section that changes how you play the mode.
Polychrome is paid at 50 per star, for your first six stars only. That is a hard ceiling of 300 Polychrome per rotation — the equivalent of just under two pulls. Stars seven, eight and nine award no Polychrome at all.
They are not worthless. Investigation Merits and Denny keep paying on every star, at roughly 80 Merits and 25,000 Denny each, so the full nine-star clear lands at about 720 Investigation Merits and 225,000 Denny plus upgrade materials. Merits are the currency you spend in the shop on W-Engine and ascension material top-ups. But if your reason for logging in is pull income, the mode is finished at six stars.
Six stars is also a much softer target: two three-star stages plus a lone star elsewhere, or three two-star clears with one extra. That is comfortably inside the reach of an account with one built team and two functional ones.
Stars seven to nine do have one other purpose. Clearing all nine in the season's Trial Mode unlocks Adversity Mode, the harder layer added in Version 3.1. It pays no additional Polychrome — it awards exclusive Honor Rewards for hitting designated scores, which are cosmetic. Worth knowing before you decide the last three stars are pointless: they are not pull income, they are the key to the mode above.
Which bosses are in the current rotation?
Rotation dated 28 August to 10 September 2026 — this lineup rotates out on 11 September.
- Notorious — Dead End Butcher. Weak to Ice and Ether. Rewards Perfect Dodges and Perfect Assists heavily, at roughly 300 points each up to a 5,000-point cap. The most forgiving of the three if your defensive play is clean.
- Girtablullu. Weak to Wind. This is the parry stage: roughly 1,000 points for a parry, another 1,000 for chaining one, and around 1,500 for breaking its Corruptive Barrier. Mechanically the highest ceiling and the highest floor.
- Primordial Nightmare — The Creator. Weak to Physical, resists Ice and Ether, and takes roughly 30% less Anomaly damage. It also uses a Control Skill you answer by dodging the opening attack and then parrying the follow-ups, which inflicts Shutdown for heavy damage and Daze.
Note the attribute spread: Ice/Ether, Wind, Physical. That is not accidental. Rotations are usually built so no single team covers all three stages, which is the mode's real design constraint.
For the lineup that arrives on 11 September, we will update this page once it is live in-game rather than publishing a test-build list. See the note at the end on what is not confirmed.
How do you build three teams for Deadly Assault?
Agents lock per stage. Once an Agent is deployed on one boss, they are unavailable for the others in that rotation. Three stages therefore means three genuinely separate squads, and the depth of your roster matters more than the strength of your best team.
A workable approach:
- Assign by attribute first, not by power. Look at the three weaknesses, then hand each stage the Agent whose attribute matches. A B-Rank hitting a weakness will usually out-score an off-attribute S-Rank on these stages.
- Give your worst team the most forgiving boss. On the current rotation that is the Dead End Butcher, where points come from defensive play rather than raw output.
- Do not split your supports evenly. A Stunner-plus-Support pairing on your strongest damage dealer is worth more than three half-built trios, because Daze windows are where the score multiplier actually lives.
- Reset stages freely. The stage-select screen has a reset option. Re-running a stage with a different squad costs nothing but time, and there is no attempt limit inside a rotation.
If you are unsure who your strongest options are this patch, our ZZZ tier list for September 2026 ranks the current roster, and the ZZZ 3.2 banner breakdown covers who is currently pullable.
What changed for Deadly Assault in Version 3.2?
The mode's structure did not change in 3.2. What changed is the toolkit you bring into it.
Version 3.2 introduced the Armorer Agent Specialty, and one of its mechanics is aimed squarely at boss content. HoYoverse's official Version 3.2 announcement describes it directly:
"The Armorer Specialty possesses the ability to trigger the Counter Assist mechanic, allowing them to contest certain enemy Control Skills and push them back."
Control Skills are exactly what the Primordial Nightmare stage is built around, so an Armorer in the party is not a generic damage upgrade — it is a mechanical answer to a specific stage type. If you are building toward Deadly Assault specifically, that matters more than raw damage numbers.
Version 3.2 also reworked the Perfect Assist cue: a golden flash now signals a Defensive Assist and a red flash signals an Evasive Assist. Since Perfect Assists are worth flat points on several rotations, retraining that reaction is worth a few thousand score on its own. Some players have additionally reported that the Evasive Assist cue behaves differently from the way it did before the patch; that is a player observation rather than a documented change, so treat it as something to watch rather than a confirmed adjustment.
For a full breakdown of the Armorer Specialty and how to gear the 3.2 debut Agent around it, see our Claret build guide.
Deadly Assault vs Shiyu Defense: which should you clear first?
They reward different accounts, and because they alternate you rarely have to choose on the same day.
- Shiyu Defense: Critical Node is a clear-based mode. You are asked to finish floors, which rewards two strong teams and punishes roster gaps less than Deadly Assault does.
- Deadly Assault is a score-based mode across three locked squads. It rewards roster breadth, attribute coverage and mechanical execution.
If your account has two excellent teams and little else, Shiyu Defense will feel far better and Deadly Assault will cap out around four or five stars. If you have six or more usable Agents spread across attributes, Deadly Assault is the easier six-star payout of the two. Neither is optional if you are chasing every Polychrome source — and if you are tracking free pull income more broadly, the Zenless Zone Zero codes page is refreshed every patch.
What is not confirmed
Two things are genuinely unknown as of 10 September 2026, and pages that state them confidently are guessing:
- The 11 September boss lineup. A new fight has appeared in datamined test builds and is circulating under a name and a set of mechanics. Test builds are not a source. This page will list the new rotation once it is live in-game.
- Exact score thresholds for the next rotation. The 6,000 / 14,000 / 20,000 pattern has held across recent rotations, but HoYoverse has adjusted thresholds before and does not publish them in advance.
Frequently asked questions
When does Deadly Assault reset in Zenless Zone Zero? Every two weeks on a Friday at 04:00 server time, alternating with Shiyu Defense: Critical Node. The current rotation runs from 28 August to 10 September 2026, and the next reset is 11 September 2026.
How much Polychrome does Deadly Assault give? A maximum of 300 per rotation. Polychrome is awarded at 50 per star for your first six stars only. Stars seven through nine award Investigation Merits, Denny and materials, but no Polychrome.
Is nine stars worth it in Deadly Assault? Only if you want the Investigation Merits and Denny — a full nine-star clear pays roughly 720 Investigation Merits and 225,000 Denny. For pull income specifically, the mode is done at six stars.
How do you unlock Deadly Assault? Reach Inter-Knot Level 40, unlock Shiyu Defense, then complete the "Deadly Situation" commission at Scott's Outpost.
Do you have to kill the boss in Deadly Assault? No. Each stage is scored on points accumulated within a three-minute timer, not on whether the boss dies. A high-damage run that never finishes the boss frequently out-scores a slower kill.
Can you use the same team on all three Deadly Assault stages? No. Agents lock to the stage you deploy them on, so a full rotation requires three separate squads.
How many attempts do you get in Deadly Assault? There is no attempt limit within a rotation. You can reset any stage from the stage-select screen and re-run it with a different team as often as you like until the reset.
What is the highest score in Deadly Assault? There is no published cap. Three stars per stage is the reward ceiling at roughly 20,000 points, and scores above that earn no additional rewards even though the counter keeps climbing.
