Ceiling_LowerAndCrush
From ZDoom Wiki
43:Ceiling_LowerAndCrush (tag, speed, crush [, crushmode])
tag: Tag of affected sector speed: How quickly the ceiling moves crush: Amount of damage to apply crushmode: Sets the crushing mode (development version only)
Usage
Lowers the ceiling of affected sectors and applies crushing damage to anything under it. If tag is 0, then the sector on the line's back side is used.
This does not lower like other crushing ceilings. The actual height of the ceiling is changing. It will lower until it is 8 units off the ground.
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.

