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Annihilation
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| Operations | ||||||
|---|---|---|---|---|---|---|
| Main Theme | Event | Tutorial | Supply | Annihilation | C.C. | Training Ground |
The map of Terra used in the Annihilation interface
Annihilation operations are distinguished from other operations by the following unique mechanics:
- There are 400 enemies (excluding those spawned from other enemies such as Originiutant Excrescences and Waregeists) and the player is given 10 Life Points; this can cause the Annihilation operation to take a very long time to be cleared.
- In the event the player loses all 10 Life Points, the Annihilation operation will be cleared instead of ending in a failure; this also occurs if the player quits the operation.
- When an Annihilation operation ends, the
Sanity is returned relative to the amount of defeated enemies. Rewards are scaled to the amount of defeated enemies; the more enemies defeated, the more rewards given.
- Should the game crash or the player quit out of/close the Arknights application in the middle of an annihilation, all sanity is refunded and no rewards will be given. Players can exploit the latter method to restart their annihilation from scratch and save sanity should they mess up as opposed to accepting a partial sanity refund and having to spend another 25 sanity to try again.
- The automatic DP generation is disabled⁎ and the maximum DP count is increased to 999. This means that using Vanguards are the only means to generate DP in Annihilation operations. Use of Merchants is highly discouraged unless the player manages to get their DP high enough to justify their use or has their MER-X Module active.
Annihilation operations are the only way to earn 
Orundum aside from trading and rewards from missions and events, but the maximum amount of Orundum one can earn from Annihilation operations in a week is limited.
The Fan Appreciation Event update in the Global server introduced a rotation system to Annihilation operations, which divides them into three categories: Permanent Missions, Rotating Mission, and Hypothetical Targets.
- Permanent Missions are always available, which includes the three original Annihilation operations.
- The Rotating Mission is available for a certain period of time. Once the Rotating Mission ends, it is moved into Hypothetical Target operations and a new operation is introduced in its place.
- Hypothetical Targets include the out-of-rotation Annihilation operations, with some being available as Simulation Mission(s) for a period of time.
- Unlike Permanent Missions and the Rotating Mission, the Simulation Mission does not award Orundum and Battle Records when cleared despite still costing Sanity to run and having the exact same Sanity return/reward rules. As such, running the Simulation Mission is only relevant if the player has not claimed its one-time rewards during the time it was a Rotating Mission.
List[edit]
| Permanent Missions | Chernobog • Lungmen Outskirts • Lungmen Downtown |
| Rotating Mission | Grand Bazaar |
| Hypothetical Targets | The Grand Knight Territory Outskirts • Frozen Abandoned City • Abandoned Mine • Flooded Seashore • Watery Tidehollow • Long Spring Wastes • Dossoles Water Gate • South Prison • County Hillock Countryside • Night Champion Show • Lingering Shangshu Trails • Chocolate Street • Penumbra Shipyards • Research Base Hanger • Lungmen Commercial District • Rest Avenue • Ashy Marsh • "The Special Little Aquapit" • Decaying Wastes • Mountain-Ringed Border Town • New Hotel Avenue • "Eccentricity" Laboratory • Burning District • Icebound Valley • Cityway 66 • Paddy Field 9-7 • Kurfürstenplatz |
| Upcoming | Saltfin Skeleton Salt Flat • Undercurrent Lair |
Trivia[edit]
- Prior to an update, the loading screen for Annihilation operations display the operation's location as "Annihilatio" instead. It was later changed to the correct "Annihilation" and, with the introduction of a rotation system to Annihilation, it was changed again to the operation's geographic location, as shown in the Annihilation world map.