Level event
From DoomRL Wiki
Each level (expect for arena type levels) starting with dlevel 10 has a chance of having a level event. The chance of rolling for a level event is min((dlevel / 2) - 1, 19) out of 100. (It is possible to roll for no event even if this check succeeds.)
The type of event is selected by a roll of 1d10 + difficulty. Each event has an associated level feeling.
| Roll | Event | Feeling |
| <4 | no event | |
| 4-6 | deadly air | The air seems deadly here, you better leave quick! |
| 7-8 | armed nuke | Descending the staircase you see a familiar object... |
| >8 | flood | You feel the sudden need to run!!! |
Contents |
Deadly Air Events
The rate of health depletion is every 0.1s × (100 - 5 × difficulty).
Armed Nuke Events
The countdown starts at (10 - difficulty) minutes.
Flood Events
The flood type can be either acid or lava. On Hurt Me Plenty and easier difficulties, acid is always used. On harder difficulties, lava is used once dlevel is at least 17.
The flood rate is usually 0.1s × max(200 - dlevel - 5 × difficulty, 60) per column. However, on Ultra-Violence and Nightmare! and if dlevel is at least 21, there is a 1/5 chance for the flood rate to be set to a ridiculous 2.5s per column.
Flood event levels feature special player and stairs placement. If possible, the player will almost always start with an x coordinate less than 20, and the stairs will have an x coordinate greater than 60. (If one of these is not possible, or very rarely on other occasions, the position will simply be random as usual.)
Frozen Walls
When the Frozen event occurs, all level walls are extremely fragile and all the fluid in the level is water
Unbreakable Walls
As the name says, all level walls become indestructuble
