Construct

Constructs are a type of devices featured in the Reclamation Algorithm game mode of Arknights.

Unlike most devices which are removed from the map as soon as the operation ends, Constructs are permanent and will last throughout the entire R.A. campaign until destroyed by enemies or dismantled at the player's discretion. Constructs can be placed in the Headquarters and all combat zones; those in the HQ will persist across R.A. campaigns and kept their HP between campaigns.

To build Constructs, the player must decide how many of a particular Construct they wanted to be in the zone and then deploy them there as with deploying units. Dismantling Constructs offer no refund of the resources used to build them; in Tales Within the Sand, when a Construct is dismantled on Build Mode, most of the resources will be refunded based on its remaining HP, up to 90% at full HP.

Certain Constructs have up to three tiers; in Fire Within the Sand, higher tier Constructs are unlocked by building at least one of the lower tier; in Tales Within the Sand, they are unlocked by upgrading the Headquarters instead. Some Constructs also have a limit on how many of these can be present at a time; once the limit is reached, more of said Constructs cannot be built.

Building Constructs outside of the HQ (as well as Campervans and Outposts in Tales Within the Sand onward) will allow the player to establish their presence there.

• By placing at least two Tier 2 or higher Combat Constructs, an Outpost will be set up, which increases the ATK of Operators deployed on the zone by 15% and causes any Raids with at most 10% remaining strength that enters the zone to be instantly eliminated.
• By placing at least two Tier 2 or higher Scout Constructs, a Sentry will be set up.
  • In Fire Within the Sand, setting up a Sentry causes nearby zones to be explored and reduces the movement speed of enemies on the zone by 15%.
  • In Tales Within the Sand, setting up a Sentry reduces the redeployment time of friendly units and MSPD of enemies by 8% and 15%, respectively.

Since Tales Within the Sand, damaged Constructs in a Headquarters or Outpost can be repaired without having to use Emergency Repair Vehicles at the cost of Crude Gold and upgradeable Constructs can be upgraded without having to replace them through Build Mode (the player still needs to expend the appropriate resources, including repairs if it was damaged, though).

List

Tales Within the Sand

Construct	Use
Auto Hub	Introduced in Expansion II, automatically produce resources daily. Can only be built in the Headquarters. Build limit: 4 or 6 depending on the Headquarters' level Auto Sawing Hub: Produces Wood Auto Quarry Hub: Produces Stone Auto Mining Hub: Produces Iron Ore
Battlement	Allows the deployment of a ranged Operator on top of it. Lv. I: The standard Construct. Lv. II: Has more HP. Lv. III: Has even more HP and increases the ASPD of the Operator on it.
Bench	Decorates the Headquarters. Build limit: 50
Combat Readiness Station	Increases the Life Points in operations where applicable. Can only be built in the Headquarters. Build limit: 1 or 3 depending on the Headquarters' level Lv. I: The standard Construct. Lv. II: Has more HP, DEF, and RES, and higher Life Point increase.
Corral	An enclosure for one tamed common Wild Beast which can be expanded by putting additional ones adjacent to each other. Can only be built in the Headquarters. Build limit: 30
Cursed Mire	Lowers the DEF and RES of enemies on top of it. Lv. I: The standard Construct. Lv. II: Has more HP and DEF, and higher DEF/RES debuff. Lv. III: Has even more HP and even higher DEF/RES debuff.
Fountain	Decorates the Headquarters. Build limit: 50
Gas Jet Thrower	Fires an air blast straight ahead, pushing back the enemy struck. Lv. I: The standard Construct. Lv. II: Has more HP and DEF, and fires further and a bit faster.
"Heart of a Slug"	Introduced in Expansion I, a trophy from beating all of the Gitmalutu Gala Races. Can only be built in the Headquarters. Build limit: 1
Large Corral	Introduced in Expansion II, an enclosure for two tamed rare and Exotic Wild Beasts. Can only be built in the Headquarters. Build limit: 12 or 20 depending on the Headquarters' level
Lootmark	Raids appear less often. Also shows trophies from defeating bosses throughout the campaign. Can only be built in the Headquarters. Build limit: 1
Operations Station	Can use a skill to temporarily nullify all damage taken by Constructs (excluding the Station itself). Build limit: 4
Phantomic Barrier	Introduced in Expansion II, reroutes enemies much like Roadblocks but does not block enemies on its own. Lv. I: The standard Construct. Lv. II: Has more HP and is invisible.
Planting Box Group	Produces Rice daily. Can only be built in the Headquarters. Build limit: 4, 8, or 12 depending on the Headquarters' level
Potting	Decorates the Headquarters. Build limit: 50
Reactive Barrier	Blocks enemies to stall them with its high DEF and 5 block count. Lv. I: The standard Construct. Lv. II: Has more HP. Lv. III: Has even more HP and explodes when destroyed, dealing heavy Physical damage to nearby enemies.
Resource Planning Station	Increases the Unit Limit in operations. Can only be built in the Headquarters. Build limit: 1 or 3 depending on the Headquarters' level Lv. I: The standard Construct. Lv. II: Has more HP, DEF, and RES, and higher Unit Limit increase.
Smelting Station	Can produce Crude Gold by using Fresh Water and Iron Ore. Can only be built in the Headquarters. Build limit: 1 Lv. I: The standard Construct. Lv. II: Has more HP, DEF, and RES, and can also produce Crude Gold with Fresh Water and Stone. Lv. III: Has even more HP and can also produce Crude Gold with Fresh Water and Wood.
Smoke Launcher	Fires a smoke grenade straight ahead that inflicts Fragile on the enemy struck. Lv. I: The standard Construct. Lv. II: Has more HP and DEF, and longer range, fires faster, and the Fragile lasts longer. Lv. III: Fires even faster and the Fragile is more effective.
Trap Net Launcher	Launches a net straight ahead, Binding the enemy struck. Lv. I: The standard Construct. Lv. II: Has more HP and DEF, launch nets a bit faster, and Binds the victim a bit longer.
Urban Style Barrier	Reroutes enemies much like Roadblocks. Lv. I: The standard Construct. Lv. II: Has more HP. Lv. III: Has even more HP and is camouflaged.
Watch Tower	Provides reconnaissance support on the vicinity. Lv. I: The standard Construct. Lv. II: Has more HP and LOS, and are camouflaged for a while. Lv. III: Has even more HP and global LOS, and are permanently camouflaged.

Fire Within the Sand

Construct	Use
Combat Readiness Station	Increases the Life Points in operations where applicable. Can only be built in the Headquarters. Build limit: 5 Lv. I: The standard Construct. Lv. II: Has more HP, DEF, and RES, and higher Life Point increase.
Firm Platform	Allows the deployment of a ranged Operator on top of it. Lv. I: The standard Construct. Lv. II: Has more HP. Lv. III: Has even more HP and more DEF.
Fortification	Blocks enemies to stall them with its high HP and DEF, and 4 block count. Lv. I: The standard Construct. Lv. II: Has more HP and DEF, and some RES.
Gas Jet Thrower	Fires an air blast straight ahead, pushing back the enemy struck. Lv. I: The standard Construct. Lv. II: Has more HP and DEF, and fires a bit faster.
Mint	Produces Crude Gold by using Fresh Water and Iron Ore. Can only be built in the Headquarters. Build limit: 1 Lv. I: The standard Construct. Lv. II: Has more HP, DEF, and RES, and higher output. Lv. III: Has even more HP and even higher output.
Modular Computing Station	Increases the Construct Points awarded at the end of the campaign. Can only be built in the Headquarters. Build limit: 4
Monitoring Tower	Lifts the Fog of War in the vicinity. Lv. I: The standard Construct. Lv. II: Has more HP, DEF, and line-of-sight, and are camouflaged. Lv. III: Has even more HP and line-of-sight, and are camouflaged.
Portable Planting Trough	Produces Rice daily. Can only be built in the Headquarters. Build limit: 12
Resource Planning Station	Increases the Unit Limit in operations. Can only be built in the Headquarters. Build limit: 3 Lv. I: The standard Construct. Lv. II: Has more HP, DEF, and RES, and higher Unit Limit increase.
Transregional Communication Station	Establishes Transregional Communication (can carry over some resources from this campaign to the next one) after a certain amount of days have passed. Can only be built in the Headquarters. Build limit: 1 Lv. I: The standard Construct. Lv. II: Has more HP, DEF, and RES, and establishes Transregional Communication sooner.
Trap Net Launcher	Launches a net straight ahead, Binding the enemy struck. Lv. I: The standard Construct. Lv. II: Has more HP and DEF, launch nets a bit faster, and Binds the victim a bit longer.
Urban Style Barrier	Reroutes enemies much like Roadblocks, but can be attacked by ranged enemies (who attacks friendly units over it). Lv. I: The standard Construct. Lv. II: Has more HP and DEF, and are camouflaged.