Comment by Galactic Navy Officer on Yes

@Yes Licht's power only activates unconsciously when he himself dies. Otherwise, he has to consciously invoke it. 

So psycho demon lord has to 1) try to manipulate or force Licht to use it 2) when Licht is not going to want to and 3) can't be threatened with death to scare him.

So it's torture or manipulation. And pyscho not only has to override Licht not liking him, he has to override Licht's loyalty to the Demon King.