This
tutorial teaches you how to create that red fog that
kills you when you fall in.
Presuming
you have your room built, place a walkway or ledge
you can stand on before you jump into the hellfog.
Next load up the SFX
texture set and
find a texture with the word hellfog in it, I used
hellfogdense for this map.
Draw out
the brush where the fog will be and assign that
texture to it.
ok, load
the common
texture set and
find the texture called trigger and near the floor
of the map make a brush which is about 32 units high
and touching the floor.
With this brush selected right click and scroll down
to the trigger section and click on trigger_hurt.
Still with this brush selected press N to bring up
the entity information and we need to make some new
settings.
In the key box type in dmg
and in the value type in 500.
What this does is set the damage that will be
inflicted on the player once he hits the trigger
hurt brush :)
Load
your map up after compiling and jump on in