The Millennium Snake Belly Fruit

When Xuanyuan Mo Ze and Feng Jiu descended, a faint glow enveloped their bodies. The Divine King Strong Exponent's aura formed a protective shield around them, making them immune to all poisons. 

Originally, their bodies were already immune to all types of poisons. Not to mention they were Strong Exponents at the Divine King level. How could they be harmed by mere poisonous fog?

"Huh? There's a cave here." As Feng Jiu descended, she noticed a cave in the distance. The cave entrance was as tall as a person and twice as wide, and half covered with vines, but it was obscured by the poisonous fog and located a long way from the base of the cliff.

Xuanyuan Mo Ze glanced at it and said, "The entrance is narrow and slippery, and the vines cover it only partly. A giant spirit snake should be inside. Be careful."