One of the sacred rites performed by evil priests upon each 
other and other servants of evil, is the rite of dark baptism.
This reinforces their own pull towards evil. The person being
baptized, if he is in the dark gods' favor, will receive a small
portion of power. Occasionally incredible abilities will be 
bestowed. If one is not favored by the dark gods, attempting a
dark baptism could be very dangerous.