The blood vampire Joseph and the young Aesop met in trouble and made a promise in front of the sword. Later, Aesop was controlled by humans in his struggle to kill Joseph. Joseph could not resist, and after predicting the future, he sacrificed his life to save Aesop. Aesop finally regained his consciousness, but accidentally killed Joseph. Aesop was devastated and asked if he ever regretted keeping him. Joseph answered with his last breath, no, and never could be.
Purpose: Protect aliens