#sci-fi setting

It is canon since if you do it 10 times, you get this achievement

In the UPR, it is believed that the soul of a living being resides in the blood. A creature dies when its blood drains out or deteriorates due to illness. Therefore, after death, they cut off the head of the deceased and drain the blood so the soul can be released faster. If this is not done, the soul can get stuck in the dead body and will be extremely displeased.

Fan fact: When the first emigrants arrived in the UNR, they were unaware of local traditions and were horrified that the locals desecrated the bodies of their comrades and didn’t allow them peace even after death. They considered this tradition an act of hostility.