Although the Healing Skills of Professionals of the three main Attributes manifested in slightly different ways, their essence was the same. They all greatly stimulated a target's latent life potential with external Energy, thereby achieving rapid healing and eliminating illness.
For a creature like a Troll, which possessed an innately strong regenerative ability, the intense stimulation of Light Attribute Healing Skills could indeed restore its bones.
However, this was not the case for ordinary creatures like humans, who had average constitutions. The bones of a Professional were notoriously difficult to regenerate, and this, coupled with a human's inherently ordinary recovery ability, meant that not even stimulating their life potential with Healing Skills could achieve bone regeneration.
This was the fundamental reason why the previous bone regeneration project of the Light Attribute Professional Association had failed.
