The Master Necromancer - Vol 1 - Chapter 74

Four-Eyed Ghost Soul did get hit by the ghost scream and take considerable damage, but it was not only this.

After the Four-Eyed Ghost Soul took the damage, its body started to move weirdly. At this time, Death Lord Energy Mark's magic created by pure Death Origin started pressing on the Four-Eyed Ghost Soul.

The Four-Eyed Ghost Soul already took a good deal of damage from the Ghost Scream magic spell, Skraal.

The reason why it took so much damage was because of the difference in the Ghost Origin. If the Four-Eyed Ghost Soul had more understanding of the Ghost Origin than the Skraal, it was not going to take any damage at all. But it had not, and it created a big problem.

Against the Death Origin, the only defense Four-Eyed Ghost Soul had was the passive defense that comes from being a ghost, which already means "death."