[Sanctuary of Ink] Event Schedule & Update Notes 2026

The [Sanctuary of Ink] version of Arknights: Endfield went live on October 15, 2026. The official Version Update Notes are now up, and they carry everything this patch adds: two new 6★ operators, four new weapons, a new Wuling area, eleven dated events, six headhunting and Arsenal Issue windows, three challenge-mode updates, and a long list of system changes.

This page is the schedule companion. It puts every dated window in one place, with the reward each one pays, so you can plan pulls and grinding without re-reading the full patch notes. For the pull math on the launch banner, see our [Rejuvenation] banner guide; for the systems overview, the [Sanctuary of Ink] version guide; and for launch-day logistics, the pre-download and maintenance guide.

Maintenance and compensation

Maintenance ran Oct. 15, 2026, 06:00–12:00 (UTC+8) on Asia and Oct. 14, 2026, 17:00–23:00 (UTC-5) on Americas/Europe — one six-hour window, not two. The update is mandatory and requires re-downloading the client (PC via GRYPHLINK, PS5 via Check for Update, iOS/Android via store).

Compensation is two separate in-game mails of [Oroberyl]×900 — one for the update and maintenance, one for bug fixes, [Oroberyl]×1800 total. Both go to accounts with a character created before the update, and both expire at the next version's maintenance, so claim them once the Mail feature unlocks.

New content: operators, weapons, areas and enemies

• New operators: 6★ Si and 6★ Argent Flow. Neither is in our character database yet — we refresh it from official data, which lags new releases, so we won't guess their class, element or voice actors here.
• New weapons: four 6★ — Jade Vessel (Greatsword), Lunar Calling (Sword), Long Heritage (Greatsword) and Complexed Industry (Sword). None are in our weapon database yet either.
• New area: [Wuling - Si's Painting], which hosts the story missions, the [Yuanyuan's Blazing Stoves] event and the new farm.
• New enemies: [Fortune's Stash], [Scroll of Tactics], [Simmer's Purge], [Maned Measure] and more.
• New stories: main missions up to [Chapter II Process VIII: Paint with Fresh Ink]; exploration missions [Miscellanies on Rampage], [Post Destination], [A Painting Open for Business] and [Farming Automation]; plus side missions including the three [Yuanyuan Innkeeper] chapters.

Every [Sanctuary of Ink] event and its dates

All times are server time. "After version update" means the event opened with maintenance; "before next maintenance" means it runs to the end of the [Sanctuary of Ink] version.

Note the gaps. Nothing new opens between Oct. 15 and Oct. 22, then Oct. 22 brings the camera event, [Murmurs of the Deep Forest] and the first content update to [Yuanyuan's Blazing Stoves]. The heaviest week is Nov. 5, when the second half of the version opens: the [Argent Flow] banner, its sign-in, the narrative event, and [Contingency Contract: Indigo Experimental Operation].

Headhunting and Arsenal Issue timeline

Six pull windows run across this version. Chartered Headhunting banners are the operator banners; Arsenal Issues are the weapon banners that run alongside them and end after three Chartered banners. Pool lists below are the 6★ operators or weapons the official notes name.

The launch-weekend pair is [Rejuvenation] + [Seal of Jade Issue]; the mid-version pair is the [Ancestral Spring Flows Anew] RE-Factor re-run + [Tender Sprig Issue]; and the second half pairs [The Hearth Fire Beckons the Starry Flow] with [Moongleam Issue]. For how Arsenal Issues work end-to-end — the guaranteed 5★+ per ticket, the Arms OC alternating with the rate-up weapon — see our Arsenal Issue explainer.

Challenge mode updates: Echoes of War, Umbral Monument and Delver of the Cryptic

[Echoes of War] is the permanent season mode our stage database files under Season Tower; for the stage-by-stage breakdown see our Season Tower stage guide. [Delver of the Cryptic] is the permanent puzzle mode — our Delver of the Cryptic guide covers the 21 stages currently in our data and the Challenge category they live in. Note that [Fade Beyond the Painting] is brand new and is not in our stage data yet.

AIC Factory and Regional Development changes

• New facility [Auto-Farmer]: once unlocked, it performs Auto-Germinate and Auto-Harvest on the farm in [Si's Painting], and later in the [Wuling City] farming area as the story progresses. For how farming fits together, see our farming and cultivation guide.
• Wuling Regional Development cap raised, along with the level cap of the [Wuling - Yinglung Pass] Stock Redistribution Terminal, and new exchangeable goods added to [Wuling Stock Redistribution]. The system is explained in our Regional Development & Stock Redistribution guide.
• Facility placement: you can now place a facility directly if it is in your Backpack or any depot, or if any depot holds enough materials to construct it.
• Farming: top-view mode for farming areas, tightly packed plots, and Fertilization Assist so team operators fertilize plots for you.
• Delivery jobs: unaccepted jobs are now picked up by other helpers instead of expiring, and every region keeps a healthy job board.

System and quality-of-life changes

• Combo skill priority: set the release order of combo skills on the Team screen, so simultaneous triggers fire in your preset sequence.
• More teams: Team06 and Team07 added — you can now edit and save seven teams.
• [Gear Plan]: save and name multiple gear loadouts to switch quickly between lineups. For gear assembly and artificing in general, see our gear sets and artificing guide.
• LTO Sanity Meds auto-use: when limited-time Sanity Meds expire they auto-convert into Sanity; any overflow converts into [Sanity Essence] via Sanity Extractors, and Sanity Essences never expire. If you are capped on both and have no Extractors, the remainder is destroyed. Our Sanity guide has the full chain.
• Cabin Shift Rotation: each cabin supports two operator shifts (A and B); use [Activate Shift] to swap manually or [Auto-Rotate], though cabin production can halt if a shift's estimated work time cannot cover the schedule.
• Gear Artificing: a new [Assembly] tab on the consume screen auto-filters gear usable as artificing material, with manual or Auto-Fill amounts.
• Clue collecting and gifting: one-click collect and fill of friend-gifted clues in [Control Nexus Task], and one-click gifting of duplicates.
• Friend visits: a [Visit Next] option jumps straight to the next friend's ship.
• Protocol Pass: Ink Scroll is the season pass; [Advanced Progression Selection Crate I] becomes [Advanced Progression Selection Crate II] and [Warp Plasma-Coated Slide] is added as a selectable material. New bundles land in the Acquisition Center, and the [Value Arsenal Ticket Pack] purchase limit resets.

Frequently asked questions

Sources

All dates, rewards and system notes above are taken from the official [Sanctuary of Ink] Version Update Notes (Oct. 15, 2026) and the related launch notices, which you can browse in our news hub. For everything else on the version, start at the guides index.