Arknights Vector Break #3 Eco Mimicry: Comps and Milestone Farming

Everything below is checked against the official Arknights event preview posted 2026-09-25 and Producer Communication #69. Numbers for enemy stats are not invented; where the official notice does not publish a value, this guide says so.

The event is a layered push map. Early stages are forgiving, later stages are not, and the gap is designed to be closed with Support Supplies rather than raw investment. That is the whole trick: activate supply nodes with three operators or fewer, then let the supplies carry the hard stages. Full guide archive lives on the GameHub mobile game guides hub.

Arknights Vector Break #3 Event Window and Unlock Conditions

When Eco Mimicry runs

Official notice: stages open 09/29 16:00 through 10/20 03:59. Unlock condition is clearing Main Story 2-10, so a new account can walk in without hoarding Sanity potions.

What the Breakthrough Milestone pays

The Breakthrough Milestone opens 09/29 16:00 through 10/23 03:59, three days longer than the stage window. Main rewards: outfit [Era Series - Lazy Humming - Kong], event furniture, module development materials, high-tier upgrade materials, battle records and Lungmen Dollars.

The three-day tail matters. Currency stops dropping when stages close, so anyone chasing the full furniture set has to finish farming before 10/20.

Arknights Eco Mimicry Special Front and Support Supply Rules

How the Special Front test zone works

Clearing the first layer opens the Special Front test zone. The rule: defeat enemies with three operators or fewer, then assign matching operators to garrison, and only then does the corresponding Support Supply activate.

That rule quietly locks your roster. A garrisoned operator cannot deploy, so do not park your carries on garrison duty out of habit.

How to pick your four Support Supplies

You can carry up to four Support Supplies and may activate or swap them manually. Most supplies grant DP, operator buffs, or mechanical effects. Spend all four slots on effects that change a stage's win condition, not on flat stat boosts. Flat stats rarely save an underbuilt team; an effect often does.

Garrison versus deploy, and why it decides the run

Garrison is long-term value, deployment is immediate value, and they compete for the same operators. A simple test: if an operator only matters on one layer, garrison them. If they are broadly useful (AoE caster, wide-range healer, single-target burst), keep them deployable. This single decision determines whether you can clear the hard layers with three operators.

Arknights Eco Mimicry Team Comps

Comp	Role	Roster	Key point
Low-investment trio	Clear normal layers, farm currency	1 Vanguard, 1 AoE Caster, 1 Medic	Deploy exactly three, garrison everything else
Mid-tier breaker	Single-target boss layers	2 Vanguards, 1 burst DPS, 1 AoE, 1 Medic	Save the mechanical supply for the boss charge-up
High-tier speed farm	Currency and milestone levels	Six or more, rotating	Unlock more supplies to cut deployed headcount

Low-investment trio positioning

The trio is not about damage, it is about never leaking. Vanguard first for DP, AoE caster on the narrowest choke, medic covering both high ground slots. No module needed, Elite 2 is enough.

When to fire the mid-tier burst window

Hard-layer enemies enter high-DEF states at fixed timings. Line up the burst skill with that window instead of stacking raw damage. This is the same principle our other Arknights breakdowns use: fix the skill rotation first, then buy investment.

Why the speed farm compounds

Speed farming is currency per minute. Once more supplies are unlocked, supply strength lets you deploy fewer operators, which frees garrison slots, which unlocks more supplies. Start the event with the farm comp, not after you finish it once.

Arknights Vector Break #3 Practical Tips and Common Mistakes

Supply activation order

1. Activate DP or starting-SP supplies first, the payoff arrives earliest.
2. Then damage reduction or healing supplies to survive the first 30 seconds.
3. Save pure damage supplies for boss-layer finishes.
4. Re-check supplies before every layer. Swaps are irreversible.

Mistakes that cost the most

Parking carries on garrison and running dry two layers later. Stopping the farm once currency "looks enough" while the outfit needs cumulative milestone levels. Remembering the furniture the day after stages close, when currency is gone.

Hands-on note: the low-investment trio clears normal layers without drama. The only wall is a two-lane layer, and swapping to a wider AoE caster solves it, no extra operators needed. On later layers, keep one fast-redeploy operator on the bench instead of garrisoned, because the fastest fix for a leak is a two-second redeploy block, not a rebuild of the whole formation.

Arknights Eco Mimicry Resource Planning

Spending module materials

Milestone module materials are a long-term bottleneck. Fix modules on your regular carries first, and do not open a module for a niche operator just to clear one limited event. If you are short on Sanity, remember the event stages also drop regular upgrade materials, so farm the milestone track you actually need rather than stopping at level one of every branch.

Should you build a new operator for this event

Priority	Target	Why
High	AoE casters, single-target burst	Useful on every layer
Medium	DP vanguards, wide healers	The floor of any low-investment comp
Low	Single-mechanic niche counters	Usually better as garrison

Playing the long game? Invest in operators with broad usage. One-and-done? Garrison and supplies are the cheaper route. More mechanic breakdowns are filed in our guides section at gghubs.com.

Arknights Vector Break #3 FAQ

Q: When does Arknights Vector Break #3 Eco Mimicry end?
A: Stages close 10/20 03:59; the Breakthrough Milestone runs to 10/23 03:59, after which currency stops dropping.

Q: Why must the Special Front use three operators or fewer?
A: It is a hard rule of the test zone, traded for the right to activate Support Supplies. You can carry up to four.

Q: How do I get the Lazy Humming outfit?
A: Raise Breakthrough Milestone levels. It is a listed main reward, not a purchase.

Q: What is the minimum I should farm before the event ends?
A: Milestone levels for the outfit and furniture first, module materials second, Lungmen Dollars last.

Arknights Vector Break #3 Action List

1. Confirm Main Story 2-10 is cleared, then enter on 09/29 after 16:00.
2. Open the map with the low-investment trio and unlock early supply nodes.
3. Farm currency daily until the milestone level holding the outfit is reached.
4. Stop farming before 10/20 and use the three-day tail to claim furniture and materials.
5. This guide gets revised after the next patch. Bookmark GameHub to check back.