Aza and Azael are the two angels who argue with God against the creation of man. These negative angels were subsequently banished to the Mountains of Darkness. Bilaam, a powerful and evil sorcerer who is spoken of in the Torah, lived during the time of Moses. Bilaam would travel to these mountains to draw all of his strength from the negative forces dwelling there.
The Zohar offers us protection against any negative people or forces that might try to harm us.