sentences:  When they reach the site indicated by Feng, Conan sees a large burial mound with a black monolith of stone towering up into the night sky, the top of which is obscured by mist.As Conan ascends the mound and prepares to dig, he finds himself being pulled inexorably toward the monolith by an invisible force.Unable to break free Conan is hurled against the monolith and held fast.