Black hole

Properties
Section	Special
Spawn temperature	22°C
Heat Conductivity	74.4%
Relative weight	100
Gravity	0
Acid dissolve rate	0%
Flammability	0
State	Solid
Source code

Creates a positive gravity field and sucks in particles (like vacuum without exerting any pressure), Newtonian gravity must be enabled. Can also be created by layering or compressing too many particles, with some exceptions such as PROT and PHOT. BHOL's gravity can be increased by increasing its tmp value.

A simple script for layering to make BHOL:

!set x all A
!set y all A

A is for example 255.