ARC Raiders Enemy Guide — All ARC Machine Types & How to Fight Them

ARC Enemy Quick Reference

Understanding ARC Machine Behavior

ARC machines are not random obstacles — they operate on defined patrol patterns, response protocols, and escalation tiers. In their neutral state, ARC units patrol set routes and scan for intruders. When they detect a Raider through sight, sound, or proximity, they enter an alert state and begin actively hunting. If the alert reaches a certain intensity — through prolonged combat, reinforcement calls, or large-scale engagement — the map can enter an escalated state where additional unit types deploy and patrol density increases dramatically.

This escalation system has major implications for how you play. Small engagements — a quick knife of one patrolling Crawler using a suppressed weapon — may go undetected by nearby units. A loud, sustained firefight with multiple units will almost certainly trigger a reinforcement response. Learning to read the ARC alert state is as valuable as any weapon skill: if you see units behaving more aggressively or converging from multiple directions, you've triggered an escalation and should prioritize exiting the area.

ARC machines also interact differently with terrain. Drones don't care about walls or ground-floor obstacles. Crawlers can navigate complex geometry quickly. Heavies are slow but their attacks can reach through light cover. Understanding each unit type's movement and attack properties allows you to predict their positions and choose cover accordingly.

Drones — Eliminate First, Eliminate Quietly

Drones are the most strategically dangerous ARC unit despite not being the most immediately lethal. Their aerial position gives them broad sightlines that ground units lack, and — critically — Drones can call in reinforcements when they detect Raiders. A Drone that spots you and transmits an alert can dramatically increase the ARC presence in your area within seconds. This is why Drones should almost always be your first target in any mixed engagement.

The Drone's underside sensor array is its primary weak point. Shots to this component deal significantly increased damage and can stagger the unit, interrupting its reinforcement call. The challenge is that hitting the underside requires positioning below the Drone or catching it at a specific angle in its patrol cycle. Suppressed weapons are ideal for Drone elimination — a quiet kill prevents alert propagation to nearby ARC units and reduces the chance of triggering the reinforcement protocol.

When multiple Drones are active, prioritize the one that has most clearly detected you or is in the best position to transmit. If you take down most Drones but leave one partially alerted, it will likely complete the reinforcement call eventually. In high-ARC zones, a pre-emptive suppressed Drone sweep before looting is a worthwhile investment in a clean, uninterrupted loot phase.

Crawlers — Speed and Numbers

Crawlers are the most common ARC ground unit and the primary source of damage for Raiders who underestimate them. Individually, a Crawler is manageable — their attacks are consistent but not overwhelming, and their HP pool is relatively low. The danger is that Crawlers operate in groups, move unpredictably at high speed, and often approach from angles that create simultaneous frontal and flank pressure.

The exposed joint assembly at the base of a Crawler's leg cluster is the designated weak point. Targeting this area requires shooting at a fast-moving, low-profile target, which is genuinely difficult in close-quarters combat. For most engagements, headshots or sustained center-mass fire is more practical than attempting weak-point shots on a charging Crawler. Reserve weak-point targeting for Crawlers at medium range where precise aiming is more feasible.

When facing a Crawler group, movement is more important than positioning. Standing still while Crawlers swarm is how you take concentrated damage from multiple directions simultaneously. Keep moving, use objects for brief cover to break their targeting, and thin the group quickly rather than focusing on any single unit for extended periods. Grenades and AoE utility items are particularly effective against clustered Crawler groups.

Heavies — Slow but Lethal

Heavy ARC units are the most threatening individual enemies in the game. Their high HP, heavy armor plating, and powerful attacks make them the primary ARC threat in high-tier zones. A Heavy can absorb enormous amounts of physical damage before going down, and their attacks deal enough damage to be seriously threatening even through good armor. Engaging a Heavy head-on with physical damage weapons is inefficient — understanding their mechanics dramatically reduces the ammunition and time required to eliminate them.

The Core Vents — exposed at the back and sides of a Heavy's chassis — are the critical weak points. Hitting these components with any weapon deals significantly increased damage and can trigger a temporary stagger, providing a window to continue dealing bonus damage. The catch is that the back vents require flanking, and Heavies are designed to face their targets. Getting behind a Heavy in a solo encounter requires either bait-and-flank tactics or exceptional movement. In a squad, one player holds the Heavy's attention while another circles for back-vent shots.

Energy damage weapons have a meaningful advantage against Heavies. The Heavy's armor plating reduces physical damage more effectively than energy damage, meaning energy-type weapons deal a higher proportion of their listed damage against this unit type. If your loadout includes energy-damage options, reserve them specifically for Heavy engagements. The damage difference over a full fight is significant enough to reduce ammunition consumption substantially.

ARC Combat Priority Order

1. Scouts: if a Scout is active, prioritize it before anything else — Scouts trigger the most dangerous reinforcement responses
2. Drones: eliminate before they can transmit reinforcement calls; suppressed shots preferred
3. Crawlers: eliminate as a group to prevent flanking; grenades accelerate this significantly
4. Heavies: engage last with full focus; use energy damage and target core vents from flanking positions
5. Turrets: destroy them when they lock down a route you need; otherwise circle around them rather than engaging head-on

General ARC Combat Tips

• Always identify which unit types are present before engaging — your tactics should shift completely between Crawler groups and Heavy encounters
• Use vertical positioning against Crawlers; they have difficulty navigating height changes quickly
• Drones scan on predictable rotations — time your movement to cross sightlines between scan sweeps
• Against Heavies, bait them into tight spaces where their movement is most limited, then maintain distance and circle
• ARC machines in alert state communicate with each other — engaging one often alerts nearby units even without suppressor
• After eliminating ARC, wait briefly before looting — occasionally additional units spawn or arrive from off-screen before the area fully clears