Lucius was born in Southern England, United Kingdom in the heart 1927. He had eventually grown up to be a member and soon leader of the secret society known as the Illuminati. He lead the Illuminati for many years and in 1963, he ordered the assassination of American President John F. Kennedy and his brother Robert in 1968 (Most likely the two were resisting or endangering the Illuminati), respectfully. He considered that Morgan Everett was to be his protégé bad made sure that he was. A hundred years later in 2027, Lucius was both still alive and still running the Illuminati and the world from behind the scenes. He lived in a fifteenth century-styled house in Geneva, Switzerland and was forced to receive medicine from Dr. Roman, who heated but desperately needed his medicine in order to stay alive.
During the events of Deus Ex: Human Revolution, Lucius is mentioned throughout the game as he had e-mailed David Sarif of Sarif Industries of a needed request but Sarif told his executive assistant to block Lucius despite the amount of money that he would promise. During this time however, his protégé in Paris is starting to see his weaknesses and is desperate the remain on top. He's also talking to seven people via hologram on how the Illuminati's plans are going.
He appeared as the main antagonist of the game.
Sometime before Deus Ex, Lucius had been cryogenically frozen by Everett in order to stay alive and was kept inside Everett's house. He gave him a advice now that he was becoming the new leader of the Illuminati but Lucius was always suspicious about Bob Page. He was angry that Everett trusted him and he was proven right when in 2035, Page and Majestic-12 had launched a military coup and overthrew the Illuminati. This led to MJ12 gaining access and soon complete control over all of the Illuminati's resources and institutions, but also took over Europe and Asia and became the de facto rulers of the two continents. DeBeers was correct and we would spend the next 17 years trying to remove Page from power and regain the Illuminati's control once more.
By 2052, (the year Deus Ex takes place), Lucius remains in his cryo pod but continues to be the de facto leader of the Illuminati as its current leader, Morgan Everett is still taking advice from him on how to effectively run the remnants of the Illuminati. Morgan had promised DeBeers that he would unfreeze him someday and would heal him to help him regain his rightful place as the Illuminati's leader. This however, is turned out to be a lie as Everett as no intention of doing it and has no resources for it. If the player finds out this information and discourse DeBeers hiding place, then JC Denton will reveal the information to him and will give the player the choice to either power down his pd and kill him, or leave it operational and keep him living. There's a message on a computer terminal in Area-51 which is an e-mail from DeBeers to Bob Page.
Lucius looks like a very old and weak person in the game. He is very frailly and looks like a fleshy skeleton as a result of failing health over the years and his age of 130. His full body is never shown as a result of the pod and it takes up most of his appearance. He's Caucasian.
Lucius seemed to be a very calm and collective person as he would continue to help out the Illuminati. He appears to be very dedicated and determined as he was able to have the Illuminati rise from the both Century to the height of its power in the 21st Century and had world leaders "eating out of his hands". He also acts as the de facto leader of the Illuminati and makes sure that everyone he meets is aware of that.
- His last name DeBeers, is a reference to the diamond cartel Debeers that once owned over 90% of the world's diamond supply in the past.
- He referes to himself as the "Supreme Enlightened One" when addressing himself.