Cyberdemon


 * For the Cyberdemon in Doom 3, see Cyberdemon (Doom 3).

The cyberdemon is perhaps the most formidable enemy in classic Doom. This monster first appears as a boss at the end of Doom level E2M8, and re-appears in the secret level E3M9, and also on E4M2, E4M6, and E4M7. The cyberdemon also appears on the retail box cover of Doom II, and is used sparingly throughout that game.

The Doom II manual of the PC version describes the monster in the following way: ''A missile-launching skyscraper with goat legs. 'Nuff said.'' The Doom manual, on the other hand, does not list it, presumably to make its climactic appearance in E2M8 a surprise. The PlayStation and SNES manual for Doom does however make mention of the cyberdemon: ''Half unfeeling machine, half raging horned devil. This walking nightmare has a rocket launcher for an arm and will definitely reach out and touch you. Make sure you're loaded for bear before you get to this guy.''

Combat characteristics
It attacks by firing barrages of three rockets. It has 4000 hit points and does not receive splash damage from explosions, making it fairly difficult to kill. It is also the fastest moving monster in the original game (The lost soul's charge attack not withstanding), and third fastest in Doom II (after arch-vile and revenant).

Cyberdemon rockets behave exactly as the player's rockets, although they cannot damage other cyberdemons. Furthermore, the cyberdemon and the spiderdemon take only direct hit damage, and are immune to all blast damage. Therefore, a greater number of rockets is required to kill these bosses than might be expected, and they must be direct hits. The cyberdemon is given a higher probability of performing his attack than other monsters, causing him to launch volleys of rockets at a high frequency. The cyberdemon does not have a melee attack. In common with other monsters, although the cyberdemon is shown with his rocket launcher in his left hand, the rockets emerge from his middle.

Tactical analysis
Killing a cyberdemon is almost impossible without a large amount of ammunition. The BFG is the most effective weapon against a cyberdemon, although the plasma gun can work fairly well. Three to four direct hits will kill a cyberdemon. If a BFG 9000 is not available, the rocket launcher is also effective. Around 45 well-placed hits with the rocket launcher will kill a cyberdemon. Killing a cyberdemon with other weapons is significantly more difficult: for example it takes around 400 bullets from a chaingun.

Because a cyberdemon has a low pain chance, it is difficult to prevent it from attacking. It is also important to be constantly aware of when it fires a rocket, as it will do so relentlessly. Circlestrafing can be used to avoid return fire while attacking. Because one rocket will often be enough to critically injure the player, it is imperative that all rockets are avoided. Because of splash damage, it is also important to stay away from the explosions. For example, it is advisable to avoid standing too close to a wall when fighting a cyberdemon, as splash damage can be sustained from rockets hitting the wall.

It is advisable to avoid close range fighting if possible, although it is possible to kill a cyberdemon in close range. When attacked at the feet with a chainsaw they have a higher pain chance and cannot aim at a player because of the close range. The cyberdemon AI is designed to retreat in such cases so this technique can only be attempted in a confined space or to draw hits from imps or revenants to provoke monster infighting. This technique does not work on other cyberdemons or arch-viles as cyberdemons are immune to their own rocket shots and do not take splash. Arch-viles will attack cyberdemons after being attacked, but the cyberdemon (as all other monsters) will not fight back.

A skilled (and/or extremely lucky) player can somewhat nullify the cyberdemon's low pain chance by straferunning towards it to get within point blank range, and then hitting it with the super shotgun. The monster will usually flinch when hit by the full twenty-pellet blast, giving the player time to retreat, reload, and repeat the process. This can take the cyberdemon down in fewer than 25 shots, but is very risky, and only recommended in areas where the rocket launcher is impractical, or to conserve rocket and plasma/BFG ammunition.

The cyberdemon's immense size can sometimes be used as an advantage when attacking it. In some maps, the cyberdemon(s) are in a large courtyard or structure and the entrance is too small for them to pass through. This can help a novice player to escape if major injuries are sustained.

Due to its firepower and hitpoints which are by far the highest among demons, the Cyberdemon easily dominates in Monster infighting battles. However, there's a 50-50 chance of them winning if fighting against the Spider Mastermind (MAP20: Gotcha!) and a large group of fairly strong demons like the Baron of Hell (MAP08: Tricks and Traps).

Data



 * 1) This table assumes that all calls to P_Random for damage, pain chance, blood splats, and bullet dispersal are consecutive. In real play, this is never the case: counterattacks and AI pathfinding must be handled, and of course the map may contain additional moving monsters and other randomized phenomena (such as flickering lights). Any resulting errors are probably toward the single-shot average, as they introduce noise into the correlation between the indices of "consecutive" calls.
 * 2) Assumes that the target takes a direct hit from each shot.
 * 3) Assumes that direct hits are possible, which does not occur in any stock map.
 * 4) Hardcoded exception to infighting prevents all damage.

Appearance statistics
In classic Doom, the cyberdemon is first encountered on these maps:

The IWADs contain the following numbers of cyberdemons:


 * 1) May be encountered earlier if the super secret level is played.

Doom RPG
In the Doom RPG, the Cyberdemon was created by evil mastermind Kronos, by combining human technology with demon flesh.

Non-Doom games

 * Main article: Doom references in other games

Doom 64
The cyberdemons in Doom 64 have not went through much changes except that they have darker colored skin, slightly stronger and are much larger. The Doom 64 version of the cyberdemon is notable for having the ability to lead its shots, making it a much more formidable opponent (the cyberdemon's 3rd rocket is usually fired at the player's anticipated position rather than the player's current position). The rockets they fire also leave smoke trails.