In a rather good mood, Lu Xiaotian had found another item that felt like a hot potato in his hands.
"Shark-Transforming Herb Gall!" Lu Xiaotian stared strangely at the green orb in his palm, about the size of a goose egg and covered in threadlike green strands.
The Shark-Transforming Herb Gall was almost useless to the vast majority of cultivators, and it was exceedingly rare in the cultivation world. Yet he had stumbled upon one despite those slim odds. He could cultivate it inside the barrier, but for him, it was a double-edged sword. The Shark-Transforming Herb Gall was a rare item recorded in the Eight Trigrams Locking-Demon Formation manual. It could transform the formation's eye—the yin-yang fish—into a pair of yin-yang demon sharks, multiplying both its offensive and defensive power. The formation had once been able to trap a Golden Core cultivator. After using the herb gall, Lu Xiaotian couldn't say whether its power would be enough to directly match a Golden Core Late Stage cultivator. Even though he had seen Chi Yunsang make a move several times, he still couldn't gauge just how powerful Chi Yunsang was. But he had nearly exhausted himself to kill Wang Tuoguai, and had almost let Wang Tuoguai turn the tables on him. If he'd had this spiritual item back then, killing Wang Tuoguai with the formation's power wouldn't have been difficult.
In the past, even if the formation had suffered some damage, Lu Xiaotian could have spent time and effort repairing it. But after the Shark-Transforming Herb Gall was used, the Eight Trigrams Locking-Demon Formation's potential would be drained in a short time, causing irreversible damage that could never be repaired. It had taken him years to refine the formation, so naturally he wasn't willing to lose it easily. This formation would