Words were spoken at the setting of time. Words which put together told a terrifying tale, a prophecy of doom.
Man had crossed into the black land and returned diseased. Evil had found a door into another Kingdom. Somehow it had to be kept shut. Prehistoric man kept vigil until it was forgotten why. Of course they thought you were crazy, but you insisted on returning to that ancient place, just to make sure. You had a feeling about these relics, a feeling of death.
Unwittingly you had sprung an invisible lock of an invisible door. A prophecy is about to be fulfilled. The Dead will rise again to eat the flesh of the living.