56 comes from the Ancient Plane search

Ye Jiu had a hard time explaining to the person on the other side what a plane trade was, and he also found out that the other side was not just the Ancient Plane, but also a Beastman's world.

He went by the name Cha, a wandering Beastman without a tribe, who got injured while hunting prey. He accidentally dripped blood onto a beautiful stone he'd picked up, then a trading interface appeared before him. By a twist of fate, he tapped on a video request and was startled to see Ye Jiu, even mistaking him for a deity.

Because Cha was quite naive, Ye Jiu easily got him talking. Cha's plane trading device was different from Ye Jiu's, which existed within his mind—if there had to be a carrier, then it was himself.

Cha's device, however, existed within a stone; only by wearing the stone could he control the plane trading device.

That is to say, if Cha carelessly lost this stone, then he would likewise lose the plane trading device.