Over time, the Council of Immortals (Immortal Man, Infinite Woman, Constant, Forever Child, and Vandal Savage) gain many followers, forming five different "Houses." The five immortals find they can also share some immortality (but not invulnerability) with those they choose, allowing some followers to remain with them for centuries. The Immortal Man is leader of the House of Action (based in a place called "the Campus"), and his followers sometimes refer to themselves as the Immortal Men. Infinite Woman and leads the House of Conquest (based in a place called "the Siege"). Other Houses include the House of Knowledge ("the Codex"), the House of Expression ("the Masque"), and the House of Harmony ("the Tabernacle"). Each House influences humanity and agrees through official treaties not to interfere with each other; the immortal Houses use different methods to block the memories of mortals who see them and learn of their secret operations. The Houses refer to their secret operations and battles as the "Eternal War" to save humanity. The House of Conquest and House of Action often clash.