I am confused with the progression. It starts off as a normal-as-you-can-get kink setting of standardized bondage. Then there are mentions of beheading, people being starved, so I'm losing you a bit... and then it turns out it's lead by some kind of witch or angel? I'm having a hard time with this. Some of the pronouns used are in the wrong direction, so that might be it, but... I dunno...
I used Google translate. they mean the dens limbs would be removed like a c-student. No one is dying. Those i don't have the full story, i think this is like a slave school. Even the girls who pass are not free. Instead they are just given prosthetic masks and armes and they also suggest there are masters, so im assuming they are sold to other people.