Although he didn't know much about everything, when his father handed him this stone, he said nothing because his grandfather did the same when passing the stone to his father. They only mentioned that it was a family heirloom passed down through many generations, but they knew nothing more about it.
Of course, after his father, grandfather, and other ancestors handled this pitch-black stone, they naturally invested time and money trying to understand the stone's true nature, but the end result was the same—their attempts ended in failure.
After generations of effort, they couldn't discover anything, which gave this pitch-black stone an aura of mystery. When the stone reached his grandfather's generation, doubts arose about whether the stone was not as magical as ancestors claimed and was perhaps just an ordinary stone.
