They survived as a culture because the Kogi focus all their energy on the life of the mind as opposed to the life of a body or an individual.
Kogi Mamas are chosen from birth and spend the first nine years of childhood in a cave in total darkness learning the ancient secrets of the spiritual world or Aluna.
Myths reveal that it was the Aluna herself who instituted coca chewing among the Kogi and who gave a lime gourd to her first son, as a symbolic wife.
The Kogi Kaishakunin was the Japanese shogun's official executioner.
A position of great power, the Kogi Kaishakunin wore robes emblazoned with the Shogun's personal crest and was the personification of the Shogun as he assisted daimyo during their seppuku.
Thus the Kogi Kaishakunin, being the personification of the Shogun, was the only one capable of assisting a Daimyo during his seppuku.