Do malevolent spirits feel pain?
Logically speaking, a person subjected to a blood sacrifice should have already abandoned their physical body, transforming their spirit and consciousness into pure life energy, meaning from the moment the ritual is complete, the physical laws of this world can no longer restrain them.
Malevolent spirits do not get hurt, nor do they feel pain.
At least, when the people confined in the Ghost Prison set up the blood sacrifice array, they firmly believed it would grant them unparalleled strength, helping them transcend all worldly constraints, and truly obtain the power to contend with the Extraterrestrials...with those eleven mechanical beings that descended from the heavens.
Because of this, it had been waiting for the seal to loosen, waiting for the day it could leave the Ghost Prison.
By then, Strange Gates and Devious Techniques would once again descend upon the world.
However...