Chaingunner

The Chaingunner — whose name in Doom II’s cast sequence is “Heavy Weapon Dude” — is one of the human-derived enemies that populate the demon-overrun installations of the Doom universe. Unlike the basic Zombieman, who carries a pistol, or the Shotgun Guy, who wields a pump-action, the Chaingunner is a substantially more dangerous former-human enemy because of its rapid automatic fire.

Identity and classification in the Doom bestiary

The enemy’s common name, Chaingunner, is derived from his weapon — the same chaingun available to the player. “Heavy Weapon Dude” is the name used in Doom II’s cast sequence, while the Doom II manual describes the monster as the “Former Commando.” The source-code identifier is MT_CHAINGUY.

The Chaingunner is a human trooper turned into a zombie during Hell’s invasion of Earth. He is part of the same former-human soldier group as the Zombieman and Shotgun Guy, but occupies its upper end because of his substantially greater offensive output. The monster is depicted wearing bloodstained red body armor and boots over slate-gray pants, distinguishing it visually from the other zombie soldiers.

Hit points and durability

The Chaingunner has 70 hit points. This places him in a middle tier of durability — tougher than a Zombieman or Shotgun Guy, but far less resilient than the heavier monsters introduced in Doom II. A player who connects with a few shotgun blasts or a burst of chaingun fire can drop a Chaingunner quickly in a direct exchange, but the enemy’s own rate of fire means that standing in the open to do so is a genuine risk calculation.

Combat role and threat profile

The chaingunner’s threat comes from its rapid hitscan attack. Each bullet deals 3–15 points of damage, and the weapon fires at approximately 466.7 shots per minute, slightly slower than the player’s chaingun just under 90% of its rate of fire. The attack is delivered in two-bullet bursts, with a line-of-sight check occurring every second shot.

Once the chaingunner starts its attack, it keeps firing without a fresh wind-up between bursts. Moreover, once it has a clear line of sight to the player, it can continue firing until the player leaves its view, the Chaingunner dies, or it is interrupted by a pain reaction. This allows successive hits to accumulate rapidly despite the relatively low damage of each individual bullet.

Chaingunners are also commonly placed in elevated or otherwise advantageous positions, such as ledges and window openings, allowing them to maintain lines of fire over areas where the player’s movement and available cover may be limited.

Special interactions

• Infighting. A chaingunner will usually survive a first hit from another monster and can sometimes use its rapid fire to stun-lock opponents such as cacodemons and arachnotrons. Its effectiveness is less reliable against monsters with a low pain chance, such as the Baron of Hell. An imp beats the chaingunner often enough so it is worth provoking.
• Arch-vile resurrection. Chaingunners follow the normal Doom resurrection rules and can be resurrected by arch-viles. A resurrected or respawned chaingunner does not drop another chaingun, even though its corpse sprite can still appear to show the weapon.

Tactics: how to defeat the chaingunner

• Break line of sight whenever possible. Use walls, pillars, doorways, and other cover to stop the Chaingunner’s fire, then reposition before attacking. Avoid crossing large open areas while exposed to one or more Chaingunners.
• Prioritize exposed Chaingunners. Their sustained hitscan fire can quickly become more dangerous than nearby slower-firing enemies. When several enemies are present, eliminate an exposed Chaingunner before it can continue firing while you deal with other threats.
• Use the right weapon for the situation. The shotgun and Super Shotgun are effective for quickly removing individual Chaingunners, while the chaingun is particularly useful at close range because sustained fire can repeatedly trigger their pain reaction and prevent them from firing back. Against groups, the rocket launcher or plasma rifle can help deal with multiple targets while limiting the time spent exposed.
• Exploit infighting when it is safe to do so. A Chaingunner can inflict significant damage on other monsters, so provoking one into attacking another enemy can reduce the opposition without requiring you to take the shots personally.
• Collect the reward after the fight. A dead Chaingunner drops a chaingun with 10 bullets, or 20 on I’m Too Young To Die and Nightmare!. Do not cross an exposed firing lane simply to reach the weapon; secure the area first.

Appearances and distribution

The Chaingunner’s placement in the original Doom II and Final Doom games illustrates his enduring utility as a combat threat. In Doom II, the player first encounters Chaingunners on MAP03: The Gantlet on Hurt Me Plenty and higher, while lower skill levels first introduce them on MAP04: The Focus. In The Plutonia Experiment, Chaingunners appear on every map except MAP11: Hunted; Plutonia contains 704 Chaingunners on Ultra-Violence, the most of any canonical Doom title.