Arknights October 9 Update Preview: Yesterday's Sea Shop and Week-One Sanity Plan | GameHub

Applicable version: as of the 2026-10-07 update (Arknights has no version-number system; the official announcement date is the time anchor)

Arknights October 9 update: maintenance window and compensation

The announcement posted on 2026-10-07 sets a forced update from 06:00 to 12:00 on October 9 . Forced updates require a fresh client download, login is closed during the window, and the old client stops working once it ends.

Three things to finish before maintenance

Clear any stage you are mid-run and close the game so settlement is not interrupted. Drain sanity close to zero, because it does not regenerate while servers are down. Finish dailies and Annihilation first, since those stay reliable while the event is still locked.

Claim order after the servers open

Take mail and compensation first, then clear the event's first-time rewards, and only then touch sanity potions. Compensation arrives by mail after maintenance and the claim window expires. Reverse that order and you spend paid resources on something the game hands out free.

Arknights Yesterday's Sea shop: which currency to spend first

Yesterday's Sea is a limited SideStory rather than a permanent Intermezzi, so its shop closes with the event . Whether you can clear it depends on tokens farmed before October 30, 03:59, not on how fast you log in.

Single-purchase slots always come first

Operator tokens, elite promotion materials and headhunting permits sit in one-time slots and convert to the best value per token, so sweep those before the unlimited Lungmen Dollar tier. Arknights Yesterday's Sea shop priority comes down to one test: if a token can buy something you may never buy again, buy that.

Event tokens do not carry over

Tokens expire when the shop closes and never transfer. Set aside the final two days for a stock check and dump the overflow into Lungmen Dollars or Originite.

Arknights Yesterday's Sea squads: three teams, three jobs

Save three squad presets before the servers open. Keep their core operators apart so one collapse does not take the other two down with it.

Squad	Purpose	Positioning	Substitute
First clear	Story stages and first-time rewards	Two Vanguards for DP, Defender mid, caster at the back	Guard covering for the caster
Farming	Repeat token and drop stages	Full auto, Defender blocks, Sniper fills, Supporter idles	Idle-friendly Guard for the manual slot
Hard stage	Event challenge and raid stages	Corrosion breaker plus a Primal Guard	Pure physical burst without a Primal Guard

Why the corrosion breaker cannot be skipped

Corrosion damage only resolves when the bar is broken, and Primal Guards do not break it themselves. That rule has not changed across 3.x . The breaker gets its own line because the preview showed a narrow skill range; without a dedicated breaker the practical output lands well under what the stat sheet suggests .

Arknights week-one sanity: splitting 1680 points

Sanity regenerates one point every six minutes, 240 a day, 1680 across seven days . That number anchors every week-one decision.

Seven-day sanity table

Day	Sanity	Spent on	Note
1	240	Story first clears	Highest marginal return in the first 24 hours
2	240	Finishing first clears	Fix positioning instead of swapping operators
3	240	Cheap shop tiers plus one material run	One-time slots first
4-5	480	Material runs and token farming	Pick stages by gap, not by habit
6	240	Hard-stage attempts	Highest retry cost of the week
7	240	Stock check and reserve	Keep one run for day eight
Total	1680	--	--

When to actually drink sanity potions

Save them for the back half and spend against shop gaps. Drinking everything early throws away the ability to reroute around real drop rates.

Arknights new operators: Clamensa, Bonefare and De Toledo

All three enter the limited headhunt, with trust gain boosted during the event . Preview material places Clamensa on the Primal Guard branch, Bonefare as an alchemist Specialist and De Toledo as a debuff Supporter; final skill values follow the live release.

What each role actually fills

Primal Guards add sustained damage into high-defense targets, alchemists add terrain interaction and interrupts, debuff Supporters add defense shred and control. The three do not overlap, so "which one is worth pulling" depends on the hole in your roster, not on raw stats.

Pull or skip, and the reasoning

Without a corrosion breaker, Clamensa delivers about half her ceiling. If the debuff slot is empty, De Toledo has the steadier general value . That is a trade-off argument, not a tier ranking.

Arknights FAQ

Do Yesterday's Sea tokens stay useful after the event ends?

A: No. Tokens expire when the shop closes and never transfer, so clear the stock in the last two days.

Should I buy sanity in week one?

A: Not in week one. Seven days of natural regen gives 1680 points, which covers story first clears plus one material run.

Does Clamensa work without a breaker?

A: She deploys but loses value. Corrosion only resolves when broken, so train a breaker such as Sanbi first.

Arknights action checklist and sources

1. Before maintenance: finish the stage, drain sanity, clear dailies and Annihilation.
2. After the servers open: claim compensation, take first-time rewards, then drink sanity potions.
3. Buy the shop in order: one-time slots, then unlimited tiers.
4. Enter hard stages after day six to keep retry costs low.
5. Check your roster for a corrosion breaker before pulling; more version planning sits in the gghubs.com guides section.