The protection of the demon god had shattered and despite the tyrannical gigantic palm attacks, they were unable to do anything to Huang Shatian. Huang Shatian's aura didn't seem to be affected. Right now, he was a human emperor, a supreme human emperor with a nine-emperor glow surrounding his body. Boundless law energy radiated from him, it was like his body had become a body of laws and the closer one got to him, the strong the pressure from his domain would be.
Right now, killing Huang Shatian would be tougher than ascending the heavens.
As to why it was so tough to kill immortal kings, it was because their bodies had reached a the pinnacle of strength.
Huang Shatian could now control a trace of immortal-king might. That, and in addition to his body strength, was enough to make him an invincible force in the immortal-foundation realm.
Before this he had already demonstrated it by effortlessly capturing Qing`er. No one had been able to block him.