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Event operations are part of various limited-time events which further expands the lore of Arknights, often covering subjects that are not elaborated in the Main Theme.

Based on their scale, event operations are divided into major and minor.

Major

Major event operations are divided into two categories, main and extra. The operations are distinguished with an event-specific prefix (e.g. "GT" for Grani and the Knights' Treasure, "OF" for Heart of Surging Flame – known in-game as Obsidian Festival) and each event consists of an average of eight to ten main operations.

  • Main operations are related to the event's plot and allows the player to farm the event's currency in addition to upgrade materials which has a higher drop rate than in Main Theme operations, especially T3 ones. However, main event operations do not have a Challenge Mode version, thus they are solely meant for farming the event currencies. As such, it is more than recommended to stock up on the materials these events provide while they are running.
  • Extra operations, distinguished by "EX" appended between the prefix and number (e.g. "GT-EX-1" and "OF-EX3"), are unrelated to the event's plot, though some do have story content that are relevant to the plot. Extra operations are more difficult than main ones and have no rewards aside of the event's currency and the usual one Originite Prime.png Originite Prime as the first drop, thus they serves as an additional challenge for the player. Unlike main event operations, extra operations have a Challenge Mode version, which gives out additional Originite Prime when cleared for the first time.

After the major event ends, their respective operations will be added into Intermezzi and/or Side Stories (see below) except for events that are live prior to A Walk in the Dust where their operations will be added after the major events' respective reruns, allowing them to be replayed anytime. However, the event operations are subject to the following changes:

  • Operations with a particular upgrade material as the regular drop have a noticeably lower drop rate for the material than when it was featured in the event (around the same rate as Main Theme operations), and therefore no longer extremely advantageous. To offset this, some of them now also have various special and/or extra drops.
    • Sub OF operations (OF-F1 to OF-F4) now costs Sanity to run but award upgrade materials when cleared.
  • Event currencies and one-time rewards are not awarded from operations that award them when it was featured in the event.
    • Because of this, main OF operations (OF-1 to OF-8) whose sole purpose is to farm the event currencies do not consume Sanity to run (albeit still costing one Drill Plan.png Drill Plan for a practice run) but have no rewards whatsoever. Prior to an update, OF operations are the best place to "boost" the player's missions' progression; the update makes missions' progress no longer count in any operations that costs no Sanity to run.
  • Progress towards medals that require clearing Operations can be obtained even after the event has ended. However, some medals are permanently unavailable after the event's run, generally those that specifically word "During the event" in their unlock condition.

Intermezzo

Intermezzi.png

Intermezzo (plural Intermezzi, which is used in-game) events have plot points and/or elements that are tied to the Main Theme, usually by providing background information and/or elaborating on certain characters involved.

Darknights Memoir
EN Darknights Memoir banner.png
A Walk in the Dust
EN A Walk in the Dust banner.png
Under Tides
EN Under Tides banner.png

Side Story

Side Story.png

Side Story events serve as additional narrative to the plot of Arknights, which is separate to the Main Theme although some are loosely tied.

Grani and the Knights' Treasure
EN Grani and the Knights' Treasure banner.png
Heart of Surging Flame
Heart of Surging Flame banner.png
Code of Brawl
EN Code of Brawl banner.png
Twilight of Wolumonde
EN Twilight of Wolumonde banner.png
Gavial the Great Chief Returns
EN Gavial the Great Chief Returns banner.png
Maria Nearl
Maria Nearl
Mansfield Break
EN Mansfield Break banner.png
Who is Real
EN Who is Real banner.png
Operation Originium Dust
EN Operation Originium Dust banner.png
Dossoles Holiday
EN Dossoles Holiday banner.png
[CN] Near Light
CN Near Light banner.png
NL-ST-1
NL-TR-1
NL-1
NL-2
NL-3
NL-4
NL-ST-2
NL-TR-2
NL-5
NL-6
NL-ST-3
NL-7
NL-8
NL-9
NL-10
NL-ST-4
NL-EX-1
NL-EX-2
NL-EX-3
NL-EX-4
NL-EX-5
NL-EX-6
NL-EX-7
NL-EX-8
NL-S-1
NL-S-2
NL-S-3
NL-S-4
NL-S-5
[CN] Break the Ice
CN Break the Ice banner.png
BI-TR-1
BI-1
BI-ST-1
BI-2
BI-3
BI-ST-2
BI-4
BI-TR-2
BI-5
BI-ST-3
BI-6
BI-7
BI-8
BI-ST-4
BI-EX-1
BI-EX-2
BI-EX-3
BI-EX-4
BI-EX-5
BI-EX-6
BI-EX-7
BI-EX-8

Vignette

Vignette operations are unrelated to the event's plot and while they have upgrade materials as a regular drop, the drop rate is usually around the same as in Main Theme operations, which is why it is recommended to not put aside one's other farming plans for these materials as one would for a major event. However, Vignette operations tend to be significantly more difficult than major events' operations, somewhere around or even above the difficulty of major events' extra operations, and also have a Challenge Mode version. This means that Vignette operations should be only completed once, including their respective Challenge Modes, to claim its first clear rewards which includes the usual Originite Prime, the event's currency, and plaques.

Prior to Children of Ursus, Vignettes interspersed their operations through the Main Theme episodes instead of using their own node map in the same fashion as major events. Ever since then, however, Vignettes have been using their own node map.

While major events only lets one unlock the story interludes in sequence, following the story, Vignette interludes are unrelated to each other (with an exception to Ancient Forge ones), available from its own menu and can be unlocked and read from any order.

Operational Intelligence
Operational Intelligence banner.png
Ancient Forge
EN Ancient Forge banner.png
Stories of Afternoon
EN Stories of Afternoon banner.png
Children of Ursus
EN Children of Ursus banner.png
Rewinding Breeze
EN Rewinding Breeze banner.png
Beyond Here
EN Beyond Here banner.png
Preluding Lights
EN Preluding Lights banner.png
[CN] Vigilo
CN Vigilo banner.png
VI-1
VI-2
VI-3
VI-4
VI-5
VI-6
VI-7
[CN] Pinus Sylvestris
Pinus Sylvestris
PS-1
PS-2
PS-3
PS-4
PS-5
PS-6
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