Serial Killer is the stage where dehumanization undergoes its initial phase and becomes entrenched.
The body becomes truly sturdy;
the mind and sharpness grow noticeably;
Knowledge of devil-worship — the bearer masters all kinds of information about the cult of the devil and its ritual magic;
Interference — he successfully disrupts others' divination and spiritual channels;
the devilish nature intensifies.
The knowledge of rites at this stage turns the Serial Killer from a dangerous man into a dangerous mystic: he is capable not only of killing, but also of arranging murders so that they work as a ritual.
The formula's composition is more terrible than most in all of mysticism: the complete skin of a man killed by one's own hand, and seven sets of the entrails of his victims.
The Path of the Abyss is honest in this regard: it does not pretend that ascension here is possible without the deaths of others.