Void

Properties
Section	Special
Spawn temperature	22°C
Heat Conductivity	100%
Relative weight	100
Gravity	0
Acid dissolve rate	0%
Flammability	0
State	Solid
Source code

Hole, will drain away any particles.

Also, it creates a small amount of pressure.

VOID is similar to the outer boundary of the simulation field, except that PSTN cannot push particles into it. Anything that falls into it will disappear.

If VOID has its ctype set to an element, it will only destroy that element. This is very useful, but not many people know because you can't simply draw over it to set the ctype like you can with CLNE, you need to use PROP or the console.