The correct answer is invoke a curse or judgment.
They were used to invoke the wrath of god upon your enemy.
By changing the type of obstacle the characters face
The prophecy from the witches state that no woman born from man shall harm Macbeth. We learn in the story that Macduff was ultimately ripped out of his mothers womb (through a c-section) this means that he was technically actually never born
It involves the military application of advanced scientific research regarding nuclear weapons, jet engines, ballistic and guided missiles, radar, biological warfare, and the use of electronics, computers and software.
