Ceiling_LowerInstant
From ZDoom Wiki
193:Ceiling_LowerInstant (tag, arg1, height)
tag: Tag of affected sector arg1: Unused height: Amount to lower ceiling by
Usage
Instantly lowers a sector's ceiling by (height * 8) units. If tag is 0, then the sector on the line's back side is used.
If the player gets stuck underneath an instantly lowering ceiling, they will not be crushed. The ceiling will make a continual activation noise until the player moves out the way such that the ceiling can set its position correctly.
Examples
As the ceiling specials are fairly trivial, examples of every one can be found in the example wad, Squash. This wad runs on Map01 of Doom2.

