"Heh heh heh, I always knew that burying the Feng Shui Bottle underground would come in handy one day, only the eyes of the Lin Family girl... can break the curse!! If the people of the Snake Sect want to survive, they need to find the Su Family girl to dig out the Spiritual Eye."
Listening to Lin Gang's almost crazed laughter.
I spoke slowly and deliberately, trying to draw more words out of Lin Gang, "So, the Feng Shui Bottle was buried by you twenty years ago, you were scheming against the Snake Sect even back then, but why? You shouldn't have had any interactions with the Snake Sect, much less any grievances."
Lin Gang had a strong force of Spiritual Power, and mixed within it was a strand of dark energy.
I guessed he must have come upon some opportunity, recently becoming an expert in Meishan Mountain Witchcraft and advancing by leaps and bounds in the Mysterious Art.
