The Northern Mountains Sutra was created by the Northern Mountains Lord.
This was an invincible cultivation technique that could tempt even immortals.
But the Northern Mountains Lord's name wasn't widely known.
At the very least, there was no mention of such a name in the books that Lin Jiufeng had read.
The books that Lin Jiufeng had read consisted of the entire royal library of the Yuhua God Dynasty. It was also the library of the martial temples that were currently famous all over the world.
Since there were no records of this name in the royal library, 99% of the people in the world back then probably had no idea as to who this Northern Mountains Lord was.
Lin Jiufeng looked at the Northern Mountains Ancient City and guessed in his heart: 'The Northern Mountains Lord must be an expert from this ancient city. That's the only explanation why he is basically non-existent in the outside world.'