Attack Type



Blocks 1 enemy and ignores the Deployment Limit, but has a long Redeployment Time

Operator Description

Castle-3, Guard robot of Rhodes Island, is assigned by Engineer Closure to carry out combat duties in the field.

Operator Quote

He knows that he's a robot.



Increases the ATK and DEF of all [Melee] allies by 10% for 10 seconds after deployment
Increases the ATK and DEF of all [Melee] allies by 12% for 12 seconds after deployment
Increases the ATK and DEF of all [Melee] allies by 14% for 14 seconds after deployment
Increases the ATK and DEF of all [Melee] allies by 16% for 16 seconds after deployment
Increases the ATK and DEF of all [Melee] allies by 18% for 18 seconds after deployment
Increases the ATK and DEF of all [Melee] allies by 20% for 20 seconds after deployment


Arts Resist
Redeploy Time
Attack Interval

RIIC Base Skills

Backup Energy Lvl: 1
Room Type:
Power Plant
When this Operator is assigned to a Power Plant, drone recovery rate +10%
Room Type:
When this Operator is assigned to a Factory, Battle Record formula related productivity +30%

Base Skill Analysis

Second RIIC Skill unlocks upon reaching Level 30.

Is it worth it? Absolutely. This is the 2nd highest possible % gain and a dirt-cheap upgrade cost.  The biggest challenge for most players will be recruiting him, as robots tend to be very rare.

Total Cost

Operator Profile

Artist TOKI
CV Atsushi Abe
Height 167cm


Castle-3 is a custom Raythean -Plus six-wheeled operations platform built by Closure. A likeable mascot for Rhodes Island, his mundane disposition means he is largely ignored.
The solid blocky appearance of Castle-3 gives off a trustworthy, dependable impression.
The marks on his casing may represent kills, but who made the marks if he has no hands?

Archive File 1

Increase Trust to 100.
He does not mind Closure's modifications, and is even quite pleased with the upgrade. His settings were changed to make Closure his favorite person, so he's satisfied with anything "Master Closure" choses to do.

Voice Lines

Appointed as Assistant Thank you for choosing Castle-3! I am honored to serve as your assistant, Doctor.
Talk 1 Doctor, please do not be intimidated by my appearance. My sturdy metal shell, modified by Master Closure herself, will make you invincible on the battlefield.
Talk 2 Warning: be careful not to strike my case too hard. It may damage me.
Talk 3 The topography in the wild may be treacherous, but Castle-3 is fitted with an engine with outstanding performance and a 4WD mode, to whisk you away from danger.
Talk after Trust Increase 1 Doctor, if your life is ever in danger, just summon Castle-3! Castle-3 was created specifically for combat purposes. I am a top-class defensive warfighting robot.
Talk after Trust Increase 2 Castle-3 is overjoyed to work with you. If you have a target that needs to be eliminated, Doctor, Castle-3 will gladly do it for you.
Talk after Trust Increase 3 Castle-3's official manager is "Master Closure,"but please understand that you are even more important to Castle-3 than Master is, in most cases. I am your devoted, trustworthy battle companion!
Idle Entering sleep mode. Press any button to wake.
Onboard Hello, Doctor. Thank you for choosing Castle-3. Tap anywhere to initialize startup options.
Watching Battle Record Firmware upgrade complete. Restart required. Please click anywhere to restart.
Added to Squad Device scan complete. All communications working as normal. Castle-3 is on standby, awaiting your orders.
Appointed as Squad Leader Understood. Castle-3 is your best choice, Doctor, to lead a squad against enemy formations!
Depart Next, Castle-3 will show you its true power as an industrial battle platform!
Begin Operation Enemy unit located. Ready for attack.
Selecting Operator 1 Castle-3, awaiting orders.
Selecting Operator 2 Castle-3, ready and waiting.
Deployment 1 Order received.
Deployment 2 Understood.
In Battle 1 Show me what you've got!
In Battle 2 Enemies, you are forbidden to advance.
In Battle 3 Count up your sins!
In Battle 4 Doctor, that was at last a worthy opponent!
4-star Result Well done, Doctor. Castle-3 is your best choice on the path of justice!
3-star Result What an exciting battle! Let's fight together again next time.
Sub 3-star Result Is everyone all right? I hope Castle-3's performance has exceeded your expectations.
Operation Failure I will hold up the rear. Everyone, retreat!
Assigned to Facility Is there anything Castle-3 can help with?
Tap Please be gentle, Doctor!
Trust Tap Doctor, would you like to grab a drink together? I might not be able to actually have a drink, but I can still treat you to one. It is fine, Master Closure will pay.
Title Arknights.
Greeting Lovely weather today, Doctor!