Il-Sec or, to use its full name, the Illuminati Security Force, is the Illuminati's elite group of commandos, bodyguards, spies and assassins. Recruited from various European special forces groups, the operatives are armed with cutting-edge and xenotech equipment. They normally act mostly as spies and observers; when the Illuminati need to exert traditional force they will use one of the many armed forces under their control.

At any one time, to minimize the risk of public exposure, there are 24 members of Il-Sec, codenamed "Midnight", "One AM", "Two AM" and so forth. The head of Il-Sec, codename "Midnight", is one of the Illuminati Secundi.