A Hint

Fang Heng looked at Randolf and said in a deep voice, "Mr. Randolf, you should have heard about the Saint. I actually learned all of this from the mouth of a Saint's inheritor."

Randolf's face was solemn and said, "Please." 

The Saint was a legend on the continent.

For some unknown reason, they had disappeared in the long river of history.

"Mr. Randolf, there are powerful demons sealed in the underground abyss. In fact, the teleportation array in the underground world can also suppress the demons in addition to teleportation."

Randolf was surprised.

"A long time ago, the Saints sacrificed their lives to seal the demons. Now, the seal on the abyssal demons has begun to loosen. If this continues, I'm afraid the Empire will fall into a catastrophe again." 

"This, this..."

Randolf's mind was in a mess.