Vast Sky Drizzle

When Jiang Ming woke up in a strange world, he learned he had obtained immortality. In the dangerous and ruthless world of cultivation, he was determined to carve his unique path. Taking advantage of his immortality, he vowed to learn forbidden skills that would normally eat away at the user’s life. 
As he continued on his path, Jiang Ming realized that with his forbidden skills, he could become the strongest. 

As An Immortal, I Only Learn Forbidden Skills

CatABoo

When Jiang Ming suddenly heard this, he could not help but be stunned.

In his imagination, this was perhaps some unknown immortal cultivator who had come from some other mysterious place and walked on the starlit path at the same time as him, thus causing them to cross paths.

He did not expect the old man to say such shocking words.

"Sir, could it be that you've guessed wrong? Perhaps this black sword is a standard weapon, and there are many of them?" Jiang Ming probed.

"Absolutely not!" The mysterious old man shook his head slightly and said, "There's only one black sword, and it has a terrifying origin. There can't be a second one. I can also feel its aura from you. Although it seemed to be very weak in your era, its aura is indeed the same."

Hundred Tribulations Sacred Body (1)