Master researcher Hidar Fen Ajidica was a gnomelike Bene Tleilax with grayish skin, a narrow face, long nose, and a pointed black beard that protruded like a trowel from his cleft chin.
He was brought to Kaitain by Count Hasimir Fenring and Crown Prince Shaddam Corrino IV to propose a spice substitute to Padishah Emperor Elrood IX. Elrood, moved by his prejudice, was surprised to see him and almost shooed him off, but Fenring and Shaddam asked that he be allowed to speak.
Together the men planned the suboid revolt on Ix to capture its manufacturing abilities and support the costly research program. Ajidica was installed as the chief researcher and govenor of Ix. It was during this time that he developed a hatred for the newly appointed imperial spice minister Fenring.
After twenty years Ajidica and his researchers discovered Amal which was at best a low quality spice. Through a captured Bene Gesserit sister-turned-Axlotl tank he created Ajidamal, a superior spice to Amal but still not an acceptable substitute. He was soon using one of the two to bribe and addict Sardaukar guards, creating his own army. He then planned to take his subordinates with him and set up his own empire funded by Amal. Part of this plan was improving upon existing Face Dancers, and dispatching them as colonists for his new empire.
Ultimately, Ajidica died from a terrible fall, with only some assistance from Count Fenring, though Ajidica was already in his death throes due to an extreme hemorrhagic reaction caused by long term addiction to the spice substitute Amal. All of his work was destroyed by the Count to hide the imperial presence in the project.
Five Thousand years later, these new Face Dancers eventually returned to the Core Worlds around the time of the Honored Matres, having been improved upon further by The Enemy. At that time, the Face Dancers tried to act as double agents with their leader Khrone, and turned on the Thinking Machines during Kralizec.
Unbeknownst to them, Erasmus had genetically installed a "kill switch", which he activated simultaneously across the galaxies, killing each and every Enhanced Face Dancer instantly.