The attempt to transcend the second mortal coil is very dangerous. Starting the process is very easy. Ending the process, on the other hand, is very difficult. And ending the process successfully can be impossible for many people to manage.
For many people that attempt the process of advancing to the third mortal coil, the main difficulty lies in being able to remain alive while the life seed evolves and splits itself into two.
Taking his own advancement for instance, his life seed assimilated most of his internal organs, including his heart and lungs. Then his life seed split into two after becoming saturated with mass and potential.
If, for one reason or another, his life seed couldn't complete the process of splitting into two and failed in the process, he would have been left without a heart, his lungs, and many other organs.
