Attention!
This Stronghold Protocol season has been released in the Global server. As such, the content of this page and the related subpages have been archived.
- This article is about the event. For the game mode, see Stronghold Protocol.
CN date
2024/11/15 – 2024/11/29
Global date
2025/05/08 – 2025/05/22
TW date
2025/08/04 – 2025/08/18
Stronghold Protocol is the pilot season of the namesake seasonal game mode in Arknights.
Operations[edit]
AC-TR-1
Entry Protocol
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Familiarize yourself with the Protocol. Condition: Initially available
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AC-1
Foundation Protocol
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Learn more about the Protocol framework. Low battle difficulty, high Funds
Reward available Condition: Unlocked by completing [Entry Protocol]
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AC-2
Core Protocol
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Fully configured; execute the Protocol. High battle difficulty, low Funds
Increased reward efficiency Condition: Unlocked by completing [Foundation Protocol]
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Operators[edit]
Factions[edit]
| Faction
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Operators
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Abyssal Hunters
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Karlan Trade
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Kazimierz
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Enemies[edit]
Two enemy factions will be chosen randomly to appear in an operation.
Kazimierzian KnightclubsContains data on Kazimierzian Knightclubs. They may be known for their style, but they are by no means short on substance. |
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| Elite
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| Boss
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| Additional information
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- Bloodblades are spawned by Dikaiopolis.
- Avengers, Bloodboil K.C. Trainees, and Nova K.C. Trainees are mutually exclusive; only one of them (and their upgraded version) will be present, chosen randomly.
- Either the Corrupted/Withered Knights or Dikaiopolis will be present as the boss.
- Avengers have 8000 HP, 400 ATK, and 300 DEF.
- The Corrupted Knight has 70000 HP and leaking him causes 10 damage to the player's HP.
- Dikaiopolis has 60000 HP, the duration of his Resurrection Stance is reduced to 30 seconds, and leaking him causes 20 damage to the player's HP.
- Hateful Avengers have 330 DEF.
- Nova Knightclub Elites have 10000 HP.
- The Withered Knight has 50000 HP and leaking him causes 10 damage to the player's HP.
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Sarkaz MercenaryContains data on Sarkaz mercenary bands and Sarkaz in advanced stages of Infection. The wealth of first-hand data obtained from combat allows for a highly realistic recreation. |
| Normal
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| Elite
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| Boss
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| Additional information
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- Blood Ambers are spawned from Sarkaz Boneguard Flayers and Torturers.
- Gifts of the Sanguinarch are spawned from Sarkaz Heirbearer Punishers.
- Gifts of Magnanimity are spawned from Sarkaz Heirbearer Scourgers.
- Sarkaz Boneguard Flayers, Sarkaz Heirbearer Punishers, and Sarkaz Lancers are mutually exclusive; only one of them (and their upgraded version) will be present, chosen randomly.
- Either Mudrock or Big Bob will be present as the boss.
- Big Bob has 110000 HP and 1300 DEF, and leaking him causes 20 damage to the player's HP.
- Mudrock has 50000 HP, her Barrier absorbs 10000 Physical/Arts damage, and leaking her causes 20 damage to the player's HP.
- Sarkaz Boneguard Flayers have:
- 15000 HP and 600 ATK at Round 3
- 17000 HP and 800 ATK at Rounds 5 to 9
- 20000 HP and 800 ATK from Round 10
- Sarkaz Boneguard Torturers have 22000 HP and 1100 ATK.
- On Round 3, Sarkaz Heirbearer Punishers have 16000 HP and 800 ATK.
- From Round 6, Sarkaz Lancers have 10000 HP.
- Sarkaz Lancer Leaders have 15000 HP and 800 ATK from Round 12.
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PathfindersContains data on Lateran Pathfinders. If you have heard rumors about the Laterans, please prepare a corresponding response, run the simulations, then seek confirmation from Sankta Operators. |
| Normal
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| Elite
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| Boss
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| Additional information
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- (Luscious) Snack Carts are spawned by (Renowned) Pathfinder Dessert Vendors.
- Famiglia Intimidators, Snipers, and Wraiths are mutually exclusive; only one of them (and their upgraded version) will be present, chosen randomly.
- Either the Forsaken One or Lost Colossus will be present as the boss.
- The Forsaken One has 75000 HP and leaking him causes 20 damage to the player's HP.
- The Lost Colossus has 85000 HP and leaking him causes 20 damage to the player's HP.
- Snipers have 4000 HP and 150 DEF.
- Sniper Leaders have 5500 HP and 180 DEF, and their special attack's Stun duration is reduced to 10 seconds.
- Wraiths have 4000 HP.
- Wraith Leaders have 6000 HP (6200 HP in Round 11).
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Convicts
Contains data on prison inmates. The only thing more dangerous than a group of criminals is a group of criminals working together. |
| Normal
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| Elite
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| Boss
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| Additional information
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- Originiutant Excrescences are spawned from Mutant Rock Spiders.
- Originiutant Tumors are spawned from Mutant Rock Spiders α.
- Arc Frontliners, Mutant Rock Spiders, and Scrap Assemblers are mutually exclusive; only one of them (and their upgraded version) will be present, chosen randomly.
- Either Jesselton or the Jetman will be present as the boss.
- The Jetman has 90000 HP, 550 ATK, and 600 DEF, and leaking him causes 20 damage to the player's HP.
- Jesselton has 70000 HP and 800 ATK, and leaking him causes 20 damage to the player's HP.
- Mutant Rock Spiders have 3500 HP.
- Mutant Rock Spiders α have 4500 HP.
- Scrap Assemblers have 350 ATK and an attack interval of 3 seconds.
- Scrap Inventors have 400 ATK and an attack interval of 3 seconds.
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Icefield MilitantsContains data on militants from Kjerag and hostiles in cold regions. Cold is their most powerful weapon, and reliance on it their greatest weakness. |
| Normal
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| Elite
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| Boss
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| Additional information
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- Icefield Arts Fighters, Trilby Ashers, and Yeti Icecleavers are mutually exclusive; only one of them (and their upgraded version) will be present, chosen randomly.
- Either the Frozen Monstrosity or Pompeii will be present as the boss.
- Frostfangs have 320 ATK at Round 1.
- The Frozen Monstrosity has 35000 HP, its invulnerability duration when spawning and after being revived is reduced to 5 seconds, loses the ability to spawn Originium Ice Crystals, and leaking it causes 20 damage to the player's HP.
- Pompeii has 85000 HP, 250 ATK, and 0.8 MSPD, and leaking it causes 20 damage to the player's HP.
- Shadowing Trilby Ashers have 1000 ATK from Round 6.
- Trilby Ashers have 30000 HP and 1500 ATK on Round 11 and from Round 13.
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Additions[edit]
New enemies:
Headhunting[edit]
The seventeenth Joint Operation headhunting banner is featured.
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