Jha'Akim, just before he entered the Spirit Transformation realm separated part of his body and used its regeneration capabilities to create another clone. He did it so that in case he ever died during his breakthrough to the Spirit Transformation realm, he could still have something to take revenge for him.
However, he never needed that clone and it stayed in its infant form for a long time. But, when Jha'Akim was imprisoned, he seemed to have needed more blood for himself. So, just before he was put behind the Primordial holy Jade, he sent a message to his infant self to do one thing for him.
That was to kill as many high-level beasts for him and feed it to the crystal, the same crystal the clone was grown in.
