Aside from the Limitless Universe Skill, Zhang Yanhang's previously enhanced Indestructible Golden Body can now be normally strengthened, but like other Origin LV.7 skills, it requires 26,214,400 Soul points, which he currently cannot afford. So, upgrading it is definitely not possible.
Even if he has extra Soul points left after clearing the entire Umbrella Biochemical Test Field, Zhang Yanhang would definitely not use them to upgrade these skills. He prefers to save the surplus Soul points for promotion to the Fifth Tier, to improve his Profession Level and new professional skills.
After all, according to the law that each generation is stronger than the last, the skills of the new tier at least shouldn't be much weaker than Heaven and Earth Devourer and Hundred Taboos, even if not as strong.
"So, the question arises: since my current Soul points balance is only enough to upgrade one skill, should I upgrade Gun Mastery or Fighting Master first?"
