Soldiers are made, not born.
Rahn is the hero of Epsilon Headquarters.
The crowning achievement of the Epsilon's experiments with human genetic manipulation conducted in secret on the prisoners of the Alcatraz Island. Born from a powerful soldier imprisoned by Yuri's enemies in Zaragoza, Rahn is an actual superhuman who surpasses his Stalker and Brute predecessors by miles in weapon expertise, combat effectiveness, and tactical thinking. Further genetic enhancements on Rahn have given him extraordinary regenerative powers as well.
Rahn is a walking killing machine and has become the Headquarters' finest commando. He has been equipped with an experimental energy beam, infused with the Terranova mutation particles, which casually pierces through reinforced steel and can transform enemy infantry into loyal Brutes.
Though more intelligent than normal men, Rahn's eternal lust for destruction hides this fact rather well. Because of this facade, his foes see him as a mere mindless weapon of murder, rather than a squad leader capable of rivaling the finest of Yuri's proselytes in strategy - a trait he has seemingly inherited from his previous life. Seeing the average human as weak and frail beings, Rahn considers mutation into Brutes as a significant step up, not only for his victim's existences. Thus, while he is a great asset to the Epsilon army, Rahn has proven to be confrontational and sometimes even disobeys orders from his active proselytes at his own leisure, continuing his killing spree even in situations that could be his undoing.
Death is not the end for you.
—Rahn engaging enemy infantry
Rahn acts as the pure muscle of Epsilon's commandos - while Libra is known for her flexibility against all targets and Malver is famed for his near-undetectable stealth, Headquarters's most powerful foot soldier utilizes unconventional yet deadly firepower in the form of his Terranova beam and respectable durability.
Epsilon HQ's specialty is genetic manipulation, and Rahn is perhaps the pinnacle of this doctrine. His primary weapon is a death sentence to any infantry he fires it upon: not only does it automatically slay all but the hardiest ground troops, it gives them a second wind in battle but as a Brute loyal to Rahn's current commanding proselyte. The presence of this genetically modified supersoldier is a threat to any infantry battalion, as not only can he decimate them in a matter of seconds, but it will also greatly bolster the number of Brutes that an HQ proselyte can have at his/her disposal. Rahn's Terranova beam also deals quite a large amount of damage against buildings and vehicles too while possessing a respectable firing range that lets him outrange most base defenses, making him an exceptionally powerful hero unit that can tackle almost any ground-based threat that comes his way.
Rahn's durability also makes him one of the tougher hero units in the game, his passive healing ability is 3x more effective than others, not to mention he is completely invulnerable to Dog bites and Spook claws. This gives him nearly unparalleled survivability, provided he isn't overwhelmed and has an opportunity to rejuvenate his health, especially if the HQ-exclusive support power Kinetic Barrier is applied to him. Just like all other hero units, he is immune to the crushing treads of all but the heaviest of vehicles, mind control, abduction, and the Foehn Revolt's confusion ray weaponry.
Join me! It's not too late!
—Rahn trying to convince enemies attacking him
While Rahn may appear to be an immortal supersoldier that knows no equal, there are some critical weaknesses that his proselytes should take note of. His Terranova beam cannot target air units so he is completely helpless against aerial threats if he is not covered properly. While he has no need to fear encroaching Dogs and Spooks, Terror Drones can and will eliminate him with one pounce - while he can easily destroy a single one, swarms will almost guarantee his demise considering the rather slow firing rate of his weapon. Although casualties for the attacking parties are inevitable, he will fall against massed anti-infantry firepower of any kind. He is also vulnerable to magnetic weapons, meaning a rogue PsiCorps proselyte can lock him down with Magnetrons or the Magnetic Beam and render him immobile. Unlike Libra and Malver, who both have special tricks to allow them to escape from a fight if it turns out bad on their part (Libra's speed and amphibious nature, Malver's permanent stealth), Rahn has neither on his side. This means he must rely on his durability and hold his ground when escape is not an option.
Terranova activated. Rahn has been successfully created. Use him to mutate enemy troops.
—Epsilon intel during Operation: Huehuecoyotl
- In Huehuecoyotl, after Epsilon Infiltrators enter the Latin Confederation's Cloning Vats, Rahn is born alongside an endless horde of Brutes, and together they wreak havoc on the Latin Confederation HQ in Zaragoza, Spain. Rahn must survive throughout the mission.
- In Divergence, Rahn is sent with Malver and four Duneriders to the PsiCorps base near an abandoned Chronosphere. Both of them must survive until they reach the base.
- In the final period of Juggernaut, Rahn will enter the battlefield with the last forces to attack the Soviets, the player needs to defeat him.
- During the Scorpion Cell's treachery in Obsidian Sands, after the Proselyte establishes a base, Rahn paradrops into the base to help subjugate the traitors. He can die without compromising the mission.
- In Insomnia, right after the second wave of Time Freeze ends, Rahn will enter the battlefield to attack the Allies, the player needs to defeat him.
- In Unthinkable, after the Paradox Engine destroys the Epsilon bases, at the bottom left corner, Rahn waits with a Driller for Libra, who must be brought to his position.
- In Nightcrawler, Rahn is required to reactive the abandoned Psychic Amplifier in Zaire, and he immediately rushes to Antarctica when Epsilon received data that the Paradox Engine is heading towards South Africa. He must survive until he reach the nearest outpost.
- In Metaphor, Rahn and his forces invade a new Chinese naval base. He is controlled by the player starting in the 1st position, who must guide him to the Atomheart and then evacuate him to a Driller.
- Rahn literally means "slim" or "skinny" in German.
- Rahn's cameo image was taken from the cancelled .
- In order to prevent killing one's own units to produce cheap Brutes, Rahn does no damage to friendly infantry. As a side effect, he cannot harm friendly units and structures in any way even when force-firing. The same applies with all genetic mutation weapons.
- Rahn's firing sound is reused from the firing sound in .