The Sun Power has always been a double-edged sword, capable of creating everything and destroying everything.
But Liu Zheng is not of the La Clan; he is rather a progeny of an alien god. Directly invoking the Ra's Divine Power within him would completely incinerate him into ashes.
However, the crown could channel the Ra's Divine Power within him, protecting him from being burned by the Sun Flame.
With Liu Zheng's healing ability, as long as he isn't burned to death on the spot, he can be saved.
The more thoroughly he's burned, the greater the chance of healing him.
"In the name of Ra Atum, God of the Sun, burn!"
Doctor Nile raised his scimitar and scepter, shouting loudly.
Gods often have many names, as does the Sun God Ra.
Different gods represent different divinities and different authorities.
Ra Atum is the god name of the Sun God Ra most closely reflecting the original divinity, useable only by the most beloved priest of God La, or divine punishment would ensue.