With regards to your son's operation...
Well, we've got good news and bad news.
Becoming what's known as a Chimera
is one of any would-be Catalurgyists
greatest nightmares; their body becomes no longer their own as the Rendling flesh implanted within them metastasizes and mutates the rest of their body into a terrible monster. The chance is not insignificant, either; 30% of all implants are failures, and 10% of those
result in a Chimera.
However there's actually a third
outcome that is rarely ever spoken of; when the body manages to resist the cancer of Rendling cells just enough
for an "equilibrium" to be reached. The unfortunate patient's body becomes a microscopic battle ground for the rest of their life, leaving no more space for any future injury or sickness at all.
The good news is, he's not dead.
In any human's journey to become a Catalurgyist
, one specific surgery must alway occur; the impanting of the Thymalladus.
This organ is of artificial design, taking specific Rendling
parts and combining with mechanical limiters in order to suppress the natural mutative properties of the monstrous biology.
A kidney is removed, the patient's immune system is suppressed, and the Thymalladus is implanted. If the patient is too weak, their immune system too overwhelmed, or the Thymalladus not properly limited, then death or Chimeric mutation occurs.