It was Su Ming's dream to reach the Transcendence Realm, hence his knowledge regarding ir was not limited to the information provided by beast skin scrolls. He had also obtained the knowledge provided by the elder over the years.
Su Ming knew that Transcendence meant that once the solidified blood veins reached a certain amount in the body, an earthshaking change would occur. That change was like a butterfly breaking out of a cocoon. The solidified blood veins would spread out from the body and turn into Berserker Blood, then the person could use his Berserker Blood to draw a Mark on his own body.
Everyone's Mark was different. There was not a single Mark that was identical to another in the world. Even if they looked similar, there were still differences. The Berserker Mark would be drawn based on the individual's vague sensation of the Mark he found within himself.