Patrol Robot

1. Summary

Patrol Robots are aging military security machines operating under automated security protocols. With Broken Survivors and Flesh Nests, they are one of the three principal types of inhabitants of D4. See: Enemies › Broken Survivor. See: Enemies › Flesh Nest.

How the two D4 enemy types contrast as forms of danger: See: Places › D4.

1.1 Core Design Principles

• Mechanical and military in appearance.
• Slow tracked movement.
• Systematic but imperfect targeting.
• Immediate hostility toward unauthorized Edmund.
• Delayed American alert transmission after detection.
• Permanent destruction through firearms, crowbars, or stealth module extraction.
• No repairs or respawning after destruction.
• Potentially reconfigurable by Amanda if still operational.
• Long-term strategic value depends on the player's earlier decisions.

2. Origin

Patrol Robots are aging, military-style robotic security platforms developed for the D4 facility.

The D4 research in hybrid computing and Analog Brains that made such machines possible is described with that technology. See: Artifacts and Technology › Analog Brains And Hybrid Computers. See: Places › D4.

Patrol Robots are remnants of an automated military security apparatus that continues executing its protocols long after the catastrophe. D4's robots continue operating autonomously on the base's experimental battery system. See: Artifacts and Technology › Experimental Battery System.

3. Appearance and Anatomy

Their appearance reflects older industrial and military robotics rather than sleek futuristic technology.

Their principal characteristics include:

• Tracked locomotion.
• A mounted machine gun.
• An optical camera for environmental observation and target identification.
• An integrated illumination system.
• A physically accessible control module.
• Heavy mechanical construction.

4. Behavior

Patrol Robots move relatively slowly and patrol designated areas of the installation.

Their behavior is governed by security protocols rather than fear, anger, or other emotional states.

4.1 Relationships With Broken Survivors

Under their original security configuration, Patrol Robots recognize Broken Survivors as authorized scientific personnel. Consequently, robots generally do not attack them.

This allows Broken Survivors to wander through robotic patrol areas without automatically triggering an armed response.

However, Amanda's Cleaning Protocol can alter this relationship. Once activated, surviving robots may recognize Edmund and authorized robotic units as allies while treating Broken Survivors as targets.

This creates a significant change in D4's local balance of power.

Edmund may choose to preserve robots for later assistance, but using them against Broken Survivors has consequences for the facility's finite human population.

As with other persistent-world events, survivors killed by robots remain dead.

4.2 American Operators And D5

Patrol Robots also operate in D5. The older Patrol Robots recognize American military operators as authorized personnel, whereas SQUAD Units classify them as intruders. See: Enemies › SQUAD Unit.

5. Detection and Combat

Under their original security configuration, Patrol Robots recognize Edmund as an unauthorized individual.

When a robot identifies him, it:

1. Initiates an armed response.
2. Attempts to track and pursue him.
3. Fires its mounted machine gun.
4. Begins transmitting an alert to American military command.

Hostile Patrol Robots engage Edmund upon detection and can kill him with their mounted machine guns.

Their targeting systems are reasonably accurate but not infallible. They may miss shots, lose sight of Edmund, or encounter limitations caused by the environment and their mechanical movement.

Unlike Broken Survivors, Patrol Robots employ systematic target tracking and established combat routines. However, they are not omniscient and do not possess perfect accuracy.

5.1 Alert Transmission Protocol

How the robots' alert differs from that of the stationary surveillance cameras, and the resulting Threat Levels, are described in Systems. See: Systems › Military Threat Levels.

5.1.1 Robot Transmission

When a Patrol Robot detects Edmund, it immediately becomes hostile and initiates a delayed transmission.

The player receives a visible indication of the active transmission and its remaining time. The duration of that countdown is still open. See: Canon › Open Questions.

Destroying or permanently disabling the robot before its transmission finishes prevents that particular alert from reaching American command.

Simply escaping the robot's line of sight or running away does not cancel an already initiated transmission.

If transmission completes:

• American command is alerted to Edmund's presence.
• The Brazilian Threat Level immediately reaches its normal maximum.
• The resulting military awareness persists across checkpoint reloads and player death.

These consequences are consistent with Schwarzwald's persistent-world design. See: Systems › Persistent Consequences.

Amanda's optional False Alarm functionality may later reverse certain alerts, subject to its established limitations. It cannot reverse the irreversible Full Military Siege state. See: Systems › Amanda's Authority And Trust.

6. Counterplay

Edmund may permanently destroy a Patrol Robot in direct combat or disable it through stealth, and, while a robot remains operational, Amanda may change its operating policies.

6.1 Permanent Destruction in Direct Combat

Edmund may permanently destroy Patrol Robots through direct physical combat.

Effective weapons include:

• Crowbars: Heavy physical blows capable of damaging the machine.
• Firearms: Gunfire capable of destroying the robot.

Knives are ineffective against their metallic construction.

Destroying a robot through combat permanently removes it from the operational security network.

The machine cannot be repaired, respawned, or restored by Amanda.

6.2 Permanent Destruction Through Stealth

Edmund may also disable a Patrol Robot through a physical stealth interaction.

The mechanic operates as follows:

1. Edmund approaches the machine from behind without being detected.
2. He moves close enough to reach its control module.
3. The player presses and holds E.
4. Edmund physically grabs and forcefully extracts the module.
5. Electrical connections, internal wiring, and mechanical attachments are torn apart.
6. The robot becomes permanently inoperative.

This is not a temporary shutdown or reversible hacking operation.

Removing the module physically destroys the robot's ability to function.

The disabled machine remains part of the persistent environment and cannot subsequently be restored.

When an alert transmission is active, completing this action before the countdown expires prevents transmission.

6.3 Amanda and Ghost Protocol

During the optional Ghost Protocol quest, Edmund may restore access to the robotic control infrastructure and authorize Amanda to modify the robots' operating policies. He restores the control room that administers the robotic patrol network and chooses whether to connect Amanda to the robotic-control network. See: Campaign › 7. A Question Of Trust.

Amanda then asks what behavior he wants the connected patrol robots to follow. The available outcomes include:

• Disable: Deactivate the operational robotic security system, shutting down all patrol robots controlled by that network.
• Passive: Leave the robots operational, but configure them to ignore all targets and refrain from attacking anyone.
• Cleaning Protocol: Reconfigure the robots to recognize Edmund and authorized networked robots as friendly, refraining from attacking robots of the same network, while treating other entities as potential targets, including Broken Survivors, and engaging other detected threats or intruders. This can create emergent conflicts with hostile entities.

The Cleaning Protocol can therefore turn surviving Patrol Robots into a significant tactical advantage.

However, these commands only affect robots that remain physically operational.

Robot command is one of the capabilities Edmund's choices can give Amanda. If she later attempts to prevent him from leaving, she can use only the systems she genuinely controls, robots among them. See: Systems › Amanda's Authority And Trust.

6.3.1 Permanent Strategic Trade-off

Destroyed Patrol Robots cannot be recovered, even after Amanda gains control of the security network.

If Edmund destroys every Patrol Robot before completing Ghost Protocol, he permanently loses the opportunity to use them as allies.

This creates a meaningful decision:

Destroying a robot eliminates an immediate threat and may prevent a military alert, but it also removes a potentially valuable asset from later gameplay.

The game must preserve this consequence rather than restoring destroyed robots for the player's convenience.

7. Population and Persistence

Patrol Robots are never repaired or respawned after destruction. Every robot destroyed in combat or disabled through module extraction is a permanent loss to the security network.

Robots of the same series in D5 are described with that level. See: Places › D5.

8. Sound and Presentation

A robot presents an identifiable mechanical threat, with detection logic and a transmission system the player can learn to understand.

The intended player experience of D4 as a whole: See: Places › D4.

9. Open Questions

The duration of the alert countdown: See: Canon › Open Questions.