| Event | Synopsis | OST | Gallery | Trivia |
| Due to being a crossover, this event will not be rerunned and/or added to Record Restoration. |
Operation Originium Dust (OD) is the tenth major event and ninth Side Story in Arknights that also acts as a crossover with Tom Clancy's Rainbow Six Siege and includes the first Multivariate Cooperation event, Defence Protocols.
Operations[]
Clear 1-10 to access OD operations.
| Task Record | OD-ST-1 • OD-TR-1 • OD-1 • OD-2 • OD-3 • OD-4 • OD-5 • OD-6 • OD-ST-2 • OD-7 • OD-8 • OD-ST-3 |
|---|---|
| Para Bellum | OD-EX-1 • OD-EX-2 • OD-EX-3 • OD-EX-4 • OD-EX-5 • OD-EX-6 • OD-EX-7 • OD-EX-8 |
Para Bellum operations are available in the second week.
All OD operations are worth 28 
.
Operators[]
The following Operators will gain 50% more Trust (except from Annihilation):
Headhunting[]
- Main article: Headhunting/Banners/Former/2021
The Attack, Defence, Tactical Collide limited crossover headhunting banner is featured.
- A single
Elite Forces Headhunting Permit can be claimed (one time only) while the Attack, Defence, Tactical Collide banner is up.
Rhodes Island Resource Allocation Certificate[]
All OD operations award 
Rhodes Island Resource Allocation Certificate when cleared, with more being given when the player clears the operation for the first time. Para Bellum operations only awards R.I. Resource Allocation Certificates when cleared for the first time. Engineering Test Indicators (Defence Protocols) missions also award R.I. Resource Allocation Certificates when completed.
R.I. Resource Allocation Certificates can be exchanged for various items at the Commissary.
The best Task Record operations to farm R.I. Resource Allocation Certificates are OD-7 and OD-8 due to their high 
Manganese Ore and 
Grindstone drop rates, respectively.
Combat Report[]
The Combat Report rewards can be claimed until September 8, 2021.
| Mission | Reward | ||
|---|---|---|---|
| Clear OD-1. |  20 | ||
| Clear OD-2. | 20 | ||
| Clear OD-3. | 30 | ||
| Clear OD-3 with 3 stars. |  | ||
| Clear OD-4. |
| ||
| Clear OD-5. | 30 | ||
| Clear OD-5 with 3 stars. |  | ||
| Clear OD-6. | 60 | ||
| Clear OD-6 with 3 stars. |  | ||
| Clear OD-7. | 60 | ||
| Clear OD-7 with 3 stars. |  | ||
| Clear OD-8. | 60 | ||
| Clear OD-8 with 3 stars. |  | ||
| Clear OD-EX-1. | 20 | ||
| Clear OD-EX-2. |  | ||
| Clear OD-EX-3. | 30 | ||
| Clear OD-EX-4. | 30 | ||
| Clear OD-EX-5. | 30 | ||
| Clear OD-EX-6. | 30 | ||
| Clear OD-EX-7. | 80 | ||
| Clear OD-EX-8. | 80 | ||
| Clear OD operations except OD-TR-1 15 times. | 40 | ||
| Clear OD operations except OD-TR-1 45 times. | 60 | ||
| Clear OD operations except OD-TR-1 85 times. | 80 |
Commissary[]
To buy all items with limited stock from the Commissary, the player must spend 6114 
.
Combat Report missions give up to 790 while first clear rewards of OD operations give up to 700 and Defence Protocols' Engineering Test Indicators missions award up to 1460 , thus requiring the player to farm an additional 3164 from OD operations.
The Commissary is open until September 8, 2021.
| Ware | Price | Stock |
|---|---|---|
 1 |
200
|
1 |
1 |
240
|
1 |
1 |
280
|
1 |
1 |
320
|
1 |
1 |
360
|
1 |
 1 |
150
|
3 |
 1 |
100
|
5 |
 1 |
45
|
10 |
 1 |
40
|
10 |
 1 |
35
|
10 |
 |
55
|
1 |
 |
45
|
1 |
 |
45
|
1 |
 |
45
|
1 |
 |
30
|
1 |
 |
30
|
1 |
 |
25
|
2 |
 |
25
|
2 |
 1 |
15
|
10 |
 1 |
12
|
10 |
 5K |
7
|
100 |
 2 |
5
|
25 |
 2 |
3
|
50 |
 2 |
1
|
120 |
 1 |
4
|
25 |
 1 |
2
|
50 |
 1 |
4
|
25 |
 1 |
3
|
25 |
 1 |
2
|
25 |
 1 |
6
|
4 |
 10 |
2
|
200 |
20 |
1
|
Unlimited |
Pinpoint Accuracy Login Event[]
During the event, login to the game for 7 days to claim the following rewards.
| Day 1 |  1 10K | ||
|---|---|---|---|
| Day 2 |
| ||
| Day 3 | 1 10 | ||
| Day 4 |  200 6 | ||
| Day 5 | 1 20 | ||
| Day 6 |
| ||
| Day 7 |  1  1 |
Store[]
The following three packs are available in the Packs Store:
| Pack | Content | Price |
|---|---|---|
| Position Defense Pack | 50K 50 4 4  3 |
US$0.99 |
| Common Tactical Pack |  13 1 100K 25  4  4 5  5 4 2 |
US$6.99 |
| Assault Elite Pack | 24  2 60K 30  5 11 5 1K |
US$29.99 |
- Note: All three packs can only be purchased once per account.
Outfits[]
The following outfits are available in the Outfit Store:
| New |
|---|
Furniture[]
- The Special Equipment Exhibition Room furniture theme is available; some of its parts are awarded as the first drop of OD operations and completing Combat Report missions while others are available in the Commissary and Furniture Store.
- The Walter Interior Sensations theme now replaces Rhodes Island HR Office as lucky drops in most operations, which is now available in the Furniture Store.
Miscellaneous[]
Operator Record/Paradox Simulation[]
New Operator Records/Paradox Simulations are added for the following Operators:
| Operator | Operator Record(s) | Paradox Simulation |
|---|---|---|
| Old Friends in Foreign Places | Enemy Ambush Control | |
| Sword and Shield | ||
| Refurbishment Plans | Floral Fragrance | |
| The Day We Left Home | Flame Net |
ID Info Update Card[]
All players will receive an 
ID Info Update Card (as an in-game mail) on August 18, 2021.