Dear Endministrator,

Welcome to the new version, [Sketches of Lost Heirlooms]!

▼// Maintenance Update & Compensation Details

■ Update & Maintenance Time

Asia Server: June 5, 2026 at 06:00 – June 5, 2026 at 12:00 (UTC+8)

Americas / Europe Server: June 4, 2026 at 17:00 – June 4, 2026 at 23:00 (UTC-5)

※ The server reopening time after maintenance may be earlier or later than scheduled. Please check the official announcement for details.

■ Maintenance Update & Bug Fix Compensation Details

· Update & Maintenance Compensation: [Oroberyl]×900

· Bug Fix Compensation: [Oroberyl]×900

· Distribution Period: After the update and maintenance – Before the next version update and maintenance

· Eligibility: Create a character before the update

· Note: Update & Maintenance Compensation and Bug Fix Compensation will be sent separately via in-game mail. The mails will expire at the start of the next version update and maintenance, so please claim them in time.

■ Update Notes

This update is mandatory. After the update is complete, you will need to re-download and reinstall the game client. Once the version update and maintenance begin, you can follow the in-game instructions to proceed with the update.

· iOS: Enter the App Store and tap [Update].

· Android: Enter the game and follow the pop-up prompts to complete the update.

· PlayStation®5: Go to the home screen, select [Arknights: Endfield], press the controller's [OPTIONS] button, select [Check for Update], and confirm the update.

· PC: After closing the game, restart the GRYPHLINK launcher and click [Update].

※ After [Sketches of Lost Heirlooms] version update, some content will unlock gradually over time as your exploration progresses. Please refer to the in-game version for the actual update details.

▼// New Version Content

■ New Stories

1. Side Missions

[Deep Vaulted Steel], [A Fistful of Reflections], [Danse Macabre]

2. Exploration Missions

[OD Project: Sky King Flats III], [Cliffside Riddles of Steel], [Trial of Swordmancy]

■ New Operators

6★ operators [Mi Fu], [Camille]

■ New Weapons

6★ weapons [Amaranthine Tassel (Greatsword)], [Phantom Pain (Greatsword)], [Blessing of Lustrous Carmine (Polearm)],

[Beacon of Duty (Polearm)]

■ New Enemies

[Rockhowler], [Armored Manglerbeast], [Craghowler]

■ New Area

[Wuling - Sword Vault Dale]

■ New Headhunting Events and Issues

1. [Fists of No Regrets] Chartered Headhunting

· Availability: After [Sketches of Lost Heirlooms] version release – June 26, 2026 at 11:59 (server time)

· Headhunting Details: [Fists of No Regrets] Chartered Headhunting features the Rate-UP 6★ operator [Mi Fu]. 6★ operators that may appear include: Mi Fu / Zhuang Fangyi / Rossi / Ember / Lifeng / Ardelia / Last Rite / Pogranichnik.

· During the Chartered Headhunting, [Combat Drills] will also become available for trying out the 6★ operator [Mi Fu]. Complete the specified stage with the preset team that includes the trial operator and go to the [Event Center] screen to claim the rewards. [One with Her Fists HH Permit] has also been added to [AIC Quota Exchange] at a discounted price.

2. [Scarlet Knot Issue] Open

· Availability: Opens after [Sketches of Lost Heirlooms] version update, and ends after 3 [Chartered Headhunting] banners (starting from [Fists of No Regrets])

· Issue Details: [Scarlet Knot Issue] features the Rate-UP 6★ weapon [Amaranthine Tassel (Greatsword)]. 6★ weapons that may appear include: Amaranthine Tassel (Greatsword) / Former Finery (Greatsword) / Sundered Prince (Greatsword) / Clannibal (Handcannon) / Rapid Ascent (Sword) / Detonation Unit (Arts Unit) / Valiant (Polearm).

3. [Expunger of Sin] Chartered Headhunting

· Availability: June 26, 2026 at 12:00 (server time) – Before version update and maintenance

· Headhunting Details: [Expunger of Sin] Chartered Headhunting features the Rate-UP 6★ operator [Camille]. 6★ operators that may appear include: Camille / Mi Fu / Zhuang Fangyi / Ember / Lifeng / Ardelia / Last Rite / Pogranichnik.

· During the Chartered Headhunting, [Combat Drills] will also become available for trying out the 6★ operator [Camille]. Complete the specified stage with the preset team that includes the trial operator and go to the [Event Center] screen to claim the rewards. [Peacekeeper's Nocturne HH Permit] has also been added to [AIC Quota Exchange] at a discounted price.

4. [Crimson Hued Issue] Open

· Availability: Opens June 26, 2026 at 12:00 (server time), and ends after 3 [Chartered Headhunting] banners (starting from [Expunger of Sin])

· Issue Details: [Crimson Hued Issue] features the Rate-UP 6★ weapon [Blessing of Lustrous Carmine (Polearm)]. 6★ weapons that may appear include: Blessing of Lustrous Carmine (Polearm) / Valiant (Polearm) / JET (Polearm) / Clannibal (Handcannon) / Thermite Cutter (Sword) / Oblivion (Arts Unit) / Exemplar (Greatsword).

※ For more headhunting and issue details, please check in-game.

■ New Events

1. [Search for Sword Vault Dale] Guide Event

· Event Time: After [Sketches of Lost Heirlooms] version release – June 26, 2026 at 12:00 (server time)

· Event Details: Complete specified missions in the [Sword Vault Dale] area to receive event rewards like [Oroberyls] and [Mark of Perseverance].

2. [One with Her Fists] Sign-In Event

· Event Time: After [Sketches of Lost Heirlooms] version release – June 26, 2026 at 11:59 (server time)

· Event Details: Sign in for a total of 7 days to earn rewards such as [One with Her Fists HH Permit]×5.

3. [A Fistful of Reflections] Narrative Event

· Event Time: After [Sketches of Lost Heirlooms] version release – Before version update and maintenance

· Event Details: Complete the side mission [A Fistful of Reflections] to acquire [Oroberyls], [Elementary Cognitive Carrier], [Protohedron], [Arms INSP Set], and other rewards.

4. [Contingency Readiness] Limited-Time Event

· Event Time: June 12, 2026 at 04:00 – June 19, 2026 at 04:00 (server time)

· Event Details: During the event, complete specified missions every day to receive rewards, including [Sanity Usage Permit], [Emergency Sanity Booster], [Wuling Artificing Catalyst], and [Coolant Gel].

5. [Contingency Contract: Re-Ignition Experimental Operation] Challenge Event

· Event Availability: June 19, 2026 at 12:00 (server time) – Before version update and maintenance

· Event Update Time: June 26, 2026 at 12:00 (server time)

· [Secret Sanctuary] Availability: June 19, 2026 at 12:00 – July 23, 2026 at 04:00 (server time)

· Event Details: During the event, you can select any combination of Test Criteria before starting the combat challenge. Complete event mission goals to earn rewards such as [Portrait: Ancient Contract], [Portrait Frame: Contingent Inscription], and [Vitrified Coins]. Spend [Vitrified Coins] at the [Secret Sanctuary] to exchange for great rewards including [Sticker: Contingency Contract], [Oroberyls], and [Advanced Progression Selection Crate I].

6. [Peacekeeper's Nocturne] Sign-In Event

· Event Time: June 26, 2026 at 12:00 (server time) – Before version update and maintenance

· Event Details: Sign in for a total of 7 days to earn rewards such as [Peacekeeper's Nocturne HH Permit]×5.

7. [Danse Macabre] Narrative Event

· Event Time: June 26, 2026 at 12:00 (server time) – Before version update and maintenance

· Event Details: Complete the side mission [Danse Macabre] to acquire [Oroberyls], [Elementary Cognitive Carrier], [Protohedron], [Arms INSP Set], and other rewards.

8. [Carly's Fairytale of Wuling] Camera Event

· Event Time: July 2, 2026 at 12:00 (server time) – Before version update and maintenance

· Event Details: Complete camera missions to earn event rewards that include: [Portrait Frame: Carly's Ink Painting Book], [Oroberyls], and [Mark of Perseverance].

9. [Sanity Supply] Limited-Time Event

· Event Time:

Asia Server: July 9, 2026 at 04:00 – July 16, 2026 at 04:00 (server time)

Americas / Europe Server: July 9, 2026 at 04:00 – July 15, 2026 at 17:00 (server time)

· Event Details: During the event, complete specified missions every day to receive Sanity Supply rewards: [Sanity Usage Permit] and [Emergency Sanity Booster].

■ Event & Gameplay Updates

1. [Trial of Swordmancy] Permanent Gameplay Mode & [Trial Algorithmics] Challenge Event

· Availability: June 12, 2026 at 12:00 (server time)

· Gameplay Details: [Trial of Swordmancy] includes 2 combat challenge modes: [Rewarded Trial Mode] and [Free Trial Mode]. Complete the [Rewarded Trial Mode] to obtain [Wuling Stock Bills]. Daily Rewarded Trial attempts are limited. Once they run out, you can still take on challenges in [Free Trial Mode].

[Trial Algorithmics] challenge event will also be available once the gameplay mode is live.

· Event Time: June 12, 2026 at 12:00 (server time) – Before version update and maintenance

· Event Details: Complete corresponding [Trial of Swordmancy] challenges during the event to earn rewards including: [Oroberyls], [Mark of Perseverance], [Advanced Progression Selection Crate Ⅰ], and [Advanced Cognitive Carrier].

2. [Umbral Monument] Challenge Gameplay Updated, [Contention of Deathly Silences] Stages Available

· Availability: July 2, 2026 at 12:00 (server time)

· Update Details: This [Umbral Monument] challenge mode introduces a new series, [Contention of Deathly Silences], featuring 6 stages. Complete all stage challenges to earn rewards that include: [Mark of Perseverance], [Advanced Cognitive Carrier], [Arms INSP Set], and [Protohedron].

[Monumental Etching: Dirge of Grief] limited-time challenge event will also be available once the gameplay mode is updated.

· Event Time: July 2, 2026 at 12:00 (server time) – Before version update and maintenance

· Event Details: Upon the release of the [Contention of Deathly Silences] series, the limited-time event [Monumental Etching: Dirge of Grief] will begin. During the event, complete various [Umbral Monument] challenges to claim [Monumental Etching: Dirge of Grief] event rewards.

※ For more event and gameplay info, stay tuned for our official announcements.

■ Acquisition Center Update

· [Protocol Pass: Viridian Mont] is available. During the [Sketches of Lost Heirlooms] version period, you can acquire various support items listed by the Arsenal Engineers in the [Protocol Pass]. Activating each seasonal Protocol Pass unlocks the [Basic Supply] tier by default. Level up the Pass to earn rewards such as [Basic HH Permit], [Oroberyls], [Exchange Crate-o-Surprise], and [Progression Materials].

· Added in [Acquisition Center: Bundles]: [Pugilistic HH Bundle], [Expurgatory HH Bundle]. The purchase limits for [Protocol Flow Bundle] and [Value Arsenal Ticket Pack] are reset.

■ AIC Factory

· The Regional Development Level cap for the [Wuling] region is increased. Added new exchangeable goods to [Wuling Stock Redistribution].

· The outpost level cap for [Sky King Flats Construction Site] is increased, and as the outpost level rises, new tradable goods and higher risk level battles for the Early Warning Terminal will also become available.

· Added a new [Backup Power] feature for emergency power supply. If a region runs out of power when you're playing, its backup power will automatically activate to temporarily supply unlimited electricity to all facilities, maximizing AIC uptime. The backup power will drain after running for a period of time, after which it requires a cooldown period to recharge.

· Added a new [Regional Overview] feature to the [Regional Development] screen, providing an overview of current information in the Regional Development System, including [Stock Redistribution] and [Depot Node], while allowing you to quickly view their locations on the map.

· New Expanded Crucible Feature [Multi-Clog Auto-Fix]: When the [Expanded Crucible] is running multiple production formulas, if all of these formulas are clogged, the [Expanded Crucible] will automatically remove all items from the cache to ensure that reactions proceed normally. This option is enabled by default, and its status will be saved along with the blueprint.

· Added quick access to [AIC Report] on the main screen. The [Report] screen now supports saving tracked product information by region.

■ System

· New Gear Artificing [Auto-Fill] Feature: When artificing gear, you can bulk-select multiple pieces of unartificed gear as the artificing materials according to a default sequence, then have artificing continue until it succeeds, reducing repetitive actions. If the artificing succeeds early, any unused gear and Gear Artificing Catalysts will be automatically returned.

· New [Weapon Batch Dismantling and Lock Management Features]:

○ Batch Dismantling: In the [Valuables Stash], you can now batch dismantle unwanted non-6★ weapons into weapon progression materials. When an attempt of [Arsenal Issue] causes the number of weapons in the [Valuables Stash] to exceed the limit, a pop-up prompt will appear, allowing you to quickly jump to the [Valuables Stash] to dismantle weapons.

○ Lock Management: You can lock or unlock all 5★ weapons with a single click, or unlock excess 5★ weapons beyond the amount needed for max potential with a single click.

· Added a new [Essence Wishlist] feature, which unlocks at Exploration Level 4. You can open the wishlist in the Severe Energy Alluvium challenge screen or [Valuables Stash - Essences] and select multiple weapons. When an acquired [Flawless Essence] matches all stats of any weapon selected in the wishlist, the essence will be automatically locked and marked as a [Perfect Match].

· Added a new permanent gameplay mode [Crisis Fragment]. Complete the side mission [Deep Vaulted Steel] to unlock the combat stage [Crisis Fragment: Craghowler].

· Added new system prompts for certain events. When specific key events start, update, or are about to end, relevant system prompts will appear in the Event Center.

· Added a [Return to Dijiang] option on the [Visit Friends] screen, which allows you to return to your own Dijiang after visiting a friend.

■ Others

· Added content such as [Operator Guide], [Energy Alluvium], [NPC], [Engraved Medal], [Profile Theme], [Portrait], [Portrait Frame], [Consumable], [Material], [Sanity Meds], [Database Entry], [Clue Dossier], and [Regional Aurylene Submission Phase]. They will gradually be unlocked as you progress further.

· Added new gear pieces to Gear Sets [Qingbo], [Swordmancer], [Grizzled Edge].

▼// Optimizations

■ Combat System

· Optimized the indicator when switching locked targets.

· Optimized warnings for attacks from off-screen enemies and added visual warning effects for these attacks.

■ AIC Factory

· Optimized [Wuling] power connection. The [Xiranite Pylons] and [Xiranite Relays] within the Core AIC Area can now be connected to outer Xiranite facilities.

· Optimized the grid display effect when placing facilities in transition zones between steep slopes / cliffs and flat ground.

■ Voice Languages and Sound Effects

· Optimized certain dialect dialogue lines in [Wuling - Wuling City].

· Optimized the voice-over performance of certain NPCs.

■ System

· Optimized the seed extraction screen in [OMV Dijiang - Growth Chamber] on both PC and mobile by removing the maximum and minimum quantity selection buttons to prevent accidental taps or incorrect actions.

· Optimized mission priority and display. In the mission list, operator side missions related to the current narrative event will be prioritized and marked with a [Recommended] tag, helping you identify mission priorities more clearly.

· Daily Task Optimization: Increased the Activity Points that can be earned from certain Daily Tasks, simplified the completion requirements for some Daily Tasks, and added new types of Daily Tasks.

○ Upon completing the [Spend 60 Sanity points] and [Spend 120 Sanity points] tasks, the Activity Points awarded for each will be increased from 10 to 20.

○ The [Defeat 20 enemies] task has been changed to [Defeat 10 enemies], with the Activity Points awarded upon completion remaining unchanged.

○ Added 2 new tasks: [In Dijiang, claim any cabin products or clues 1 time] and [Purchase elastic goods in any Stock Redistribution site 1 time]. Upon completion, each task will award 20 Activity Points.

· Optimized how [Weekly Routine] is displayed in the Event Center. After you claim all routine rewards for the week, the [Weekly Routine] tab will no longer be prioritized.

· Optimized the engraving permit selection logic when claiming Energy Alluvium rewards: After manually turning off the engraving option for any single Energy Alluvium, the engraving option for that Energy Alluvium will remain off thereafter.

· Optimized the reward claiming logic for the beginner events [New Horizons] and [Authority Level Rewards].

· Added certain system notifications for mobile devices. The system will send reminders when conditions are met. A toggle for these notifications has also been added in [Settings - Others].

■ Others

· Optimized the display effect of portraits in [Baker - Messages] under specific circumstances.

· Optimized the crosshair UI while spraying liquid.

· Optimized the visual effects and sound effects in certain scenes.

· Optimized the switching logic between controller and keyboard/mouse controls.

· Optimized button display and button display order on certain screens when playing with a controller.

▼// Bug Fixes

■ Missions

· Fixed an issue where the mission tracker displayed abnormally under specific circumstances.

■ System

· Fixed an issue where custom map markers displayed abnormally under specific circumstances.

· Fixed an issue where the map for [Wuling City - Qijian Dais] was missing when checking the [Wuling] Region Overview.

· Fixed an issue where some markers at the edges of the map did not disappear properly after clearing selected markers in [Marker Tags].

· Fixed an issue where the map screen displayed abnormally under specific circumstances.

■ Others

· Fixed an issue where operators who were disconnected in Active Blight zones under specific circumstances could incorrectly remain within an Active Blight zone upon resuscitation.

· Fixed an issue where parts of the overview screen were abnormally blocked by the scene under specific circumstances.

· Fixed an issue where sound effects of some operators were abnormal under specific circumstances.

· Fixed an issue where the models of some NPCs displayed abnormally under specific circumstances.

· Fixed an issue where certain scenes displayed abnormally under specific circumstances.

· Fixed an issue where NPC [Perlica]'s model could shake abnormally during the main mission [Chapter Ⅱ Process Ⅲ: Surging From a Withered Spring] on some mobile devices.