Damaging floor

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For more information on this article, visit the Damaging floor page on the Doom Wiki.

Damaging floors are sectors which deal damage the players inside them.

ZDoom allows several different manners in which a sector can be made to automatically inflict damage. It can be:

Many types of damaging floors can be protected from by having a PowerIronFeet, PowerMask or derivative in inventory; usually obtained by picking up a RadSuit or using an EnvironmentalSuit. However, this protection might be affected by "leaks" where there is a 5 out of 256 risk (a bit less than 2%) for full damage to be inflicted regardless.

Sector types

The following sector types provide this effect:

Type Name Damage Frequency Damage type Protection? Notes
68 dLight_Strobe_Hurt 20 Every 32 tics Slime Leak Light alternates cyclically 5 tics bright then 15 tics dark and loop.
69 dDamage_Hellslime 10 Every 32 tics Slime Yes
71 dDamage_Nukage 5 Every 32 tics Slime Yes
75 dDamage_End 20 Every 32 tics None No Clears god mode cheat but player cannot die, level exits when health at 10 or less.
80 dDamage_SuperHellslime 20 Every 32 tics Slime Leak
82 dDamage_LavaWimpy 5 Every 16 tics Fire No
83 dDamage_LavaHefty 8 Every 16 tics Fire No
84 dScroll_EastLavaDamage 5 Every 16 tics Fire No Light alternates cyclically 5 tics bright then 15 tics dark and loop, sector scroll and carry.
85 hDamage_Sludge 4 Every 32 tics Slime Yes
104 sLight_Strobe_Hurt 5 Every 32 tics Slime Yes Light alternates cyclically 5 tics bright then 15 tics dark and loop.
105 sDamage_Hellslime 5 Every 32 tics Slime Yes Delayed poison damage, hazard count +2 per tic
115 Damage_InstantDeath 1000000 Every tic InstantDeath No
116 sDamage_SuperHellslime 5 Every 32 tics Slime Yes Delayed poison damage, hazard count +4 per tic
196 Sector_Heal 1 Every 32 tics N/A No Heals players instead of damaging them
256 N/A 5 Every 32 tics Fire Yes Boom-style generalized sector, cannot be combined with a normal damage type.
512 N/A 10 Every 32 tics Slime Yes Boom-style generalized sector, cannot be combined with a normal damage type.
768 N/A 20 Every 32 tics Slime Leak Boom-style generalized sector, cannot be combined with a normal damage type.

Two of the above types, originating from Strife, feature a poison build-up system. While they do inflict five points of slime damage every thirty-two tics, the way in which the damage is only inflicted once the poison has reached a certain level of build-up and continues even after leaving the sectors until the poison has been sufficiently cleansed is unique and not really customizable with any of the other methods.


In Hexen, the following textures are by default set to have damage types.

Texture Damage Frequency Damage type Protection Notes
X_001 5 Every 32 tics Fire No A sector using X_002, X_003, or X_004 will not animate and not inflict damage.
F_033 0 N/A Ice N/A The damage type here merely makes frozen corpse chunks last longer before they melt.

A custom TERRAIN lump can define other types of texture-based damage. Any damage type can be used, including custom damage types. The frequency can be any power of two. RadSuits and similar items can protect from such damage.


In the Universal Doom Map Format, it is possible to directly specify a terrain's damage characteristics with the following sector properties:

  • damageamount
  • damagetype
  • damageinterval
  • leakiness
  • damagehazard
  • damageterraineffect

Every sector type can be replicated with these properties - in fact that is what the sector types actually get converted into -, and new combinations are possible.

In addition, the following properties can be used in conjunction with terrain effects:

  • floorterrain


The Sector_SetDamage allows to modify or set the sector's damage values which are initialized both from the sector types and the UDMF properties. There is also a SetSectorDamage ACS function which allows to do the same with actual damage types instead of the old MeansOfDeath parameter.

Since these three methods all affect the same set of data, only one effect can be present at any time. When a map gets initialized the UDMF properties take precedence over the sector types.

The terrain based damage is a separate entity, so this will always be added on top of the regular sector damage.


The last method available is entirely ACS-driven. With SectorDamage, the damage is applied instantly when the function is called, and no more afterwards. For a continuous effect similar to the previous methods, use a looping script which will call SectorDamage repeatedly. Although more complicated to use, it offers unparalleled flexibility. Since it is called from a script, it can use any frequency wanted, not just powers of two — it can even be random intervals. The amount of damage can also be anything, including random values or values computed in real time from several parameters. Protective items can be any sort of inventory item, not necessarily the IronFeet or Mask powerups. The "leak" can be simulated by using a random chance of calling the function with an empty string for its protection_item parameter instead of the normal call where a valid item is named.

It is even possible to use this function to damage monsters and actors not touching the ground, instead of only players with their feet on the ground. Use the DAMAGE_IN_AIR flag to affect actors not touching the ground (falling, flying, stepping on another thing, perched atop a 3D floor, 3D middle texture or a bridge thing).

Drowning damage

If the level's MAPINFO map definition feature an airsupply value greater than zero (the default value is 20 by the way), a player will start to drown after spending as many seconds underwater. A PowerIronFeet effect continually reset the player's air supply while active, so radiation shielding suits double as SCUBA gear.

Once a player's air supply is exhausted, drowning damage is inflicted every 32 tics. The damage inflicted increase over time, starting at two points and increasing by one for each additional damage spent without breathing.

The air supply runs out while the player is fully immersed (waterlevel 3). This means the player has to be within swimmable deep water, created either through Transfer_Heights or Sector_Set3dFloor.

Note: Since Doom Legacy did not feature drowning damage, maps in the Doom format which feature FraggleScript code will disable drowning altogether unless the drown flag is set in the level info section of said FraggleScript.

Damaging 3D floors

If a 3D floor's control sector inflicts damage (through any of the means above), damage will also be inflicted by stepping on the 3D floor if it is solid, or by being inside it if the floor is non-solid. Using SectorDamage on a 3D floor's control sector works as expected in the target sector. Using SectorDamage with the DAMAGE_IN_AIR flag on the control sector will affect actors inside or above the 3D floor in the target sector (but actors below the 3D floor are safe). This effect is not stopped by additional 3D floors placed above the first.

Damaging transferred heights

With Transfer_Heights, the control sector's damage is not taken into account. If Transfer_Heights is used to create deep water, the sector damage will be inflicted in any part of the swimmable area. If Transfer_Heights is used to create unswimmable areas (the player's waterlevel isn't increased), then damage is only inflicted when touching the ground. Using SectorDamage with the DAMAGE_IN_AIR flag will of course work as expected on the tagged sector; but again, if it is used on the control sector, it will not be transferred to the target sector.

See also