Throughout history, onyx has been thought to bring powers of protection, defensive magic, and the reduction of sexual desires. It has also been thought to reinforce the knowledge that there is no death, aiding in the understanding of the wheel of birth, death and rebirth. It brings about the knowledge that separation is an illusion and reunion will come. It aids psychic contact with those who have died, facilitates séances and mediumship, brings messages from the dead, and aids past-life and between-lives regression work. It helps future life progressions, and prevents and removes spirit possessions.