(Latin) Genius is Latin for "guardian deity or spirit that watches over each person; spirit, incarnation" from root of gignere "beget, produce." Lucis is Latin for "light."
"...the genius lucis... is the Odic or magnetic force with which the animal ego is converted into cosmic dust. We must learn how to utilize the genius lucis in order to eliminate the “I.” The genius lucis of man and woman can eliminate all of those entities that form the “I,” the “myself,” because it is the weapon used in order to destroy the ego." - Samael Aun Weor, Tarot and Kabbalah