The Archer fires a powerful homing rocket. It must be locked onto a target before it can be fired. When aimed, a targeting window flips out, allowing target acquisition. Hold this window over the target continuously until a lock is achieved, then fire.
The Archer's high power is compensated for by its lock-on time of 1.05 to 1.55 seconds, depending on your distance from the target. It can lock-on to enemy Dropships, Heavy Turrets, and Titans.
The Archer has a maximum lock-on range of 123.825 meters.
To lock-on to a Titan with the Archer Heavy Rocket aim down the sight at a Titan until the red lock-on indicator is shown. At this point, firing the weapon will launch a rocket that will track the Titan. Note that when you begin to lock onto a Titan, the pilot in it receives warning and approximate direction from which he is targeted. Also, there is a sound indicator of missile approaching.
The Archer Heavy Rocket is completely useless while rodeo attacking, as you cannot zoom in to get the required lock on. Even if you do, it does not deal more damage and will kill you with the missile explosion. Also, it can't be used while hanging from walls.
Because of its 1.05 to 1.55 second lock on and 3.8 second reload time, this weapon is best used at extremely long ranges over clear sight lines, where the locked on rocket will not fly uselessly into obstructions. The Quick Reload Kit can improve reload times and, also, it's rate of fire.
Using this weapon in Angel City is not recommended, as the Sidewinder or other Anti-Titan weapon will provide more DPS given the short and/or straight paths throughout the map.
When used by Grunts, rockets will deal 68% less damage against titans than if a pilot were using it.
This weapon is a great way to deal a massive amount of damage to an unsuspecting Titan. However, the weapon is ineffective when fighting a Titan head-on due to the lack of manual fire and having a long lock-on time—you must aim at a Titan and achieve a lock before the weapon can be fired. The most difficult part of using this weapon is following up after you score a hit with the initial rocket. Be sure to have cover nearby because the Titan can tell when the Archer locks on. The Titan will surely be gunning for you after you hit it once. Better yet, target a heavily damaged Titan to doom it, and then prepare to engage the ejecting Pilot.