The dragonification process was invented to initially purify the bloodlines of the lesser dragon species to their superior dragon forms.
It was by pure accident that it was later discovered that non-draconic species could be converted to half-draconic species by the procedure.
Ever since this discovery the process was kept a well-guarded secret of the upper echelons of the dragon society.
Dragon's were favoured by nature as a species having great vitality and defence while being more attuned to mana than any other species in the universe except the angel race.
When an individual went through the draconification process it was noticed that their mana veins became much wider and smoother than before, whereas previously collapsed or damaged mana paths in their bodies were observed to be cured.