I have not personally invoked the energy of stars, however a fellow Spiritual Satanist experimented with the energies of Caput Algol. Her posts got erratic after she invoked the energy and she almost got banned from the Joy of Satan forums because High Priest Don thought she was insane. She went back to being sane after she had not invoked the energies of Caput Algol for a while. For your own personal safety, do not mess with the energies of Caput Algol. Work with a positive star like Betelgeuse instead.