Agent Lex (acronym for Lethal Efficiency Experiment) is a Mechari agent built by Axis Pheydra herself. According to A Test of Loyalty, he was personally built and trained by Axis Pheydra in arts of Espionage. After his training, Axis ordered Lex to assassinate Emperor Myrcalus as his first mission. He accepted the mission despite the Mechari's programming that prevented them from harming Luminais. He infiltrated the emperor's palace at night and utilized his infiltration training to avoid the Draken royal guards. He was killed by Solid Snake in the Second War.