Yang Chan had applied the Bear Gallbladder Skin-Toughening Ointment to his body. He had concocted this medicated ointment not long ago, remaking it after arriving in White Jade City. It couldn't be stored for too long, or its efficacy would diminish, which would in turn affect his daily gain of Potential Points.
He had verified this through experience. At first, he'd nearly thought he was developing a resistance, but he later discovered it was because the Bear Gallbladder Skin-Toughening Ointment had been stored for too long. Therefore, Yang Chan only ever prepared a few days' worth for his personal use, concocting a new batch whenever he needed it.
It hadn't been suitable to concoct it on the road, but after arriving in White Jade City, he naturally got back to his old trade. It didn't require Earth Fire, so the process was relatively simple.
