"The game of the devil"

Mr. Steven, a member of a sect arrives at the end of his days on earth. Few times before his death planned by the god of their fraternity, a message came from their god saying that he should offer hundred human heads before he can find a life of twenty-five years older. To facilitate the task to this unfortunate member, their grand responsible provided him with a liquid that he should give to the young men that will handle the operations for him to drink so that they will become invisible any time they pronounce their god's name before getting into any operation. As soon as everything is set, the invisible killing started threatening the population.