Tengobushi
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The Tengobushi was a caste of the powerful ancient race of Kamishi. Unlike the higher castes, they could not change their appearance at will and were humanoid in appearance. They were skilful in stealth and combat. They could extract information from an individual by removing the brain from a hole in the skull, leading to the individual's death. Tengobushi could create energy discs by the power of their will. If captured, they used their ability to control energy to commit suicide by holding hands together.
A group of Tengobushi arrived on Earth to retrieve a Kamishi artefact. They were led by Dokan, a Kamishi of higher caste. (AUDIO: Death in Geneva, The Battle of the Tower)