Gateway to Hell

"Speaking of the Shadow Realm, do you know how I can reach that place?" Yuan asked.

"I know there's a way to get there in the lower heavens, but I'm not sure I can enter that place again, so I will need a new path there."

"The Fourth Heaven." Dong Ye responded, continuing in a grim voice, "In the Fourth Heaven, there is a place called Vanishing Valley. It's a dangerous area, one of four 'Gateway to Hell' to exist in the Nine Heavens."

"Gateway to Hell?" Yuan raised an eyebrow.

Dong Ye then explained, "They are also called forbidden zones — extremely dangerous areas that even Immortals avoid at all costs. Most people that enter will never return, hence the name. Fortunately, the Vanishing Valley is the least dangerous of the four out there… but that's not really saying much."