The "Observation Skill" was a technique Lord Sun found in some corner of the Library Pavilion in Hiram Garden. After reading it once, he casually began to cultivate it. It wasn't a sophisticated technique; it's primarily used by those refining immortality to evaluate the grade of Immortal Pills. There are many such techniques, most of which are more effective and accurate, and so this obscure "Observation Skill" gradually fell out of practice.
This Immortal Skill also includes many linked Divine Powers, one of which allows one to see through poisons.
Cash had opened his mouth ready to bite, but after hearing this, he dared not gamble anymore. He stared at the Immortal Apricot in his hand, readjusting his gaze and muttering, "How can I not see any difference?
Samara's face changed as she stepped forward and slapped the Immortal Apricot out of Cash's hand, glaring angrily at him. "Are you trying to poison our Lord?" Cash looked aggrieved, "How could I..."
