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Invulnerability

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Invuln sphere map08

An invulnerability found in Doom II MAP08: Tricks and Traps.

Blackandwhite-HellRevelead-map14

A view of Hell Revealed MAP14: City in the Clouds after obtaining an invulnerability.

The invulnerability is a powerup that makes the player generally impervious to damage for 30 seconds. The player is not protected from telefrags, and will still recoil from a successful attack. The powerup looks like a green sphere with a grinning red-eyed head inside. While it is active, the colors in the player's display change to inverse monochrome, and the eyes of the status bar face glow yellow (STFGOD0), making them look similar to the Demon's; in the last few seconds the display will begin blinking back to its original colors. While the inverted monochrome effect is activated the game is effectively fully bright, and the player will be able to see every detail even in the darkest areas. Spectres in particular become much easier to see under its effects.

Invulnerability can also be activated with the cheat code idbeholdv.

In deathmatch mode of vanilla Doom, invulnerabilities and blur artifacts never respawn. Some source ports allow flags to be set to cause them to respawn.

Invulnerabilities are included in the items percentage displayed at the end of each level.

Technical

According to the function P_DamageMobj in p_inter.c, invulnerability only protects the player from attacks doing less than 1000 points of damage; while no monster in the game can do nearly that much damage in one attack (a direct hit from the rocket of a cyberdemon will inflict at most 288 damage), a telefrag inflicts 10000 points (and indeed will kill even an otherwise invulnerable player). This also means that DeHackEd can be used to circumvent the invulnerability powerup by creating incredibly powerful weapons.

Notes

Betainvinsiblity

The early invulnerability powerup, as seen in MBF's emulation of the Doom press release beta.

  • The grinning face inside the sphere appears to be derived from the Lost Soul sprite in Doom 0.4. Oddly enough, the invulnerability sphere in that version of the game was invisible and had an unused sprite in the IWAD which looked like a giant health bonus.
  • Due to limitation of engine, the Invulnerability Artifact lights up all the areas in the game similar to the Light Amplification Visor. It would require a complete table of 32 shades for a proper effect.
  • Interestingly, although a damaging floor of Type 11 will cancel the effect of the God mode cheat, the invulnerability artifact will remain active while the player is in such a sector until its proper duration has expired. This property of the artifact would theoretically allow players who obtain one using the idbeholdv cheat to buy enough time that they can clear out ending Type-11 rooms containing monsters, such as the one in Phobos Anomaly.
Invulnerability data
Thing type2022 (decimal), 7E6 (hex)
Appears inRegistered Doom
Ultimate Doom
Doom II/Final Doom
Radius20
SpritePINV
ClassArtifact
Pickup

Appearance statistics

Invulnerability-colormap-bug

A bug caused Vanilla Doom to fail to invert the sky color

The IWADs contain the following numbers of invulnerability artifacts:
GameITYTD and HNTRHMPUV and NM
Ultimate Doom161516
Doom II292423
TNT: Evilution151312
Plutonia555

See also

Sources

Items from Doom and Doom II
Health Health bonusStimpackMedikitSupercharge
Armor Armor bonusArmorMegaarmor
Powerups BackpackBerserkComputer area mapInvulnerabilityLight amplification visorMegaspherePartial invisibilityRadiation shielding suit
Keys Keycard • Skull key
Weapons FistChainsawPistolShotgunSuper shotgunChaingunRocket launcherPlasma gunBFG9000
Ammo Clip4 shotgun shellsRocketEnergy cellBox of bulletsBox of shellsBox of rocketsEnergy cell pack

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