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Arc deploy close.gif
TSA.png Frontiersmen
Team Resources
Marines res.png 10
Icon marine supply.gif 25 / 200
Move Speed: 2, 0.8 (in combat)
Abilities and Upgrades
Sonic Cannon, Deploy, Undeploy
Tech Requirements:
ARC Robotics Factory
Build Time: 10 seconds
Builds From: ARC Robotics Factory
Purchase By: Marine Commander


The ARC is a Marine Commander controlled robotic vehicle built for besieging heavily infested Kharaa territory; it is constructed from the ARC Factory by the Marine Commander. The ARC can be deployed to unleash its experimental sonic-based weapon to deal massive damage to alien structures, regardless of any physical obstruction between the ARC and its targets. However, Marines are often required to escort, provide defense and line-of-sight for the siege vehicles, due to the long cooldown period between sonic blasts and absence of armor when the ARC is deployed.

Differences from Original Natural Selection

The main difference from NS1 siege cannons is that the ARC has mobility. It still possesses the ability to attack through walls*. However, it must be deployed in order to attack (thus stationary), requires line of sight to lock onto targets (from friendly Marines, robotic units, buildings or Scanner Sweep) and can un-deploy to enable movement.

Tactical Summary - ARC

  • ARCs are mainly used to breakthrough Kharaa structures
  • ARCs are slow moving and expensive, defending them or attaching a MAC is a recommended action.
  • ARCs do not provide a line of sight and require a marine actively looking at a structure or line of sight from an Observatory or Scan.
  • The blue circle around the ARC is its effective range, try to use this to your advantage by keeping it as far away from combat but still being effective.
  • Kharaa Shades can deploy Ink that can hinder the sight ability of the ARC, you may have to clear out the shades before you continue your assault.
  • Two Gorges and a Crag can sustain a Hives health even while being sieged, encourage marines to push in and clear the gorges and other support structures.
  • Flamethrowers are a good defensive tool when defending ARCs as they actively deny Bile Bomb from directly damaging them, it can also destroy Cysts en route to their deployment position.


Targeted Abilities

Sonic Cannon

Sonic Cannon
The ARC can unleash a supersonic blast through walls and devastate Kharaa structures.
Damage 675
Type Splash
Radius 26
Delay 3 seconds
Targets Revealed Structures (not covered by Ink)
Requires Deployed Arc, Direct Line of Sight (Marine or Scan)

ARC blasting a Hive room through walls

Toggled Abilities



Deploy Arc
Arcdeploy buildmenu.png
Puts ARC into firing mode. While deployed, the ARC cannot move and loses all armor.
Delay 3 seconds
Requires Not Moving
ARC deployed and ready for siege
Undeploy Arc
Arc buildmenu.png
Puts ARC into movement mode. While undeployed, the ARC cannot attack and has armor.
Delay 3 seconds
Requires None
ARC armored transport mode