ZDoom

/***** Centaur Scorches ****************************************************/

decal CentaurScorch
{
	pic BLAST02
	shade "00 00 00"
	x-scale 0.7
	y-scale 0.7
	randomflipx
	randomflipy
}

/***** Demon2 Scorch *******************************************************/

decal Demon2Scorch
{
	pic BLAST02
	shade "00 00 00"
	x-scale 0.65
	y-scale 0.65
	randomflipx
	randomflipy
}

generator Demon2FX1			Demon2Scorch
generator WraithFX1			Demon2Scorch

generator CentaurFX			CentaurScorch

CentaurScorch too:
[code]/***** Centaur Scorches ****************************************************/

decal CentaurScorch
{
pic BLAST02
shade "00 00 00"
x-scale 0.7
y-scale 0.7
randomflipx
randomflipy
}

/***** Demon2 Scorch *******************************************************/

decal Demon2Scorch
{
pic BLAST02
shade "00 00 00"
x-scale 0.65
y-scale 0.65
randomflipx
randomflipy
}[/code]

These are allocated to actors:
[code]
generator Demon2FX1 Demon2Scorch
generator WraithFX1 Demon2Scorch
[/code]
[code]
generator CentaurFX CentaurScorch
[/code]



I also had a quick check in the textures.txt lump to see if it was defined there (nope).
Looking back at old files, it does seem to have been missing for a long time (maybe forever).

The decal Demon2Scorch calls for the graphic BLAST02, which isn't present in the main pk3.