"The altar is supposed to be in the basement," you say as you open the door that leads into a creaky cellar.
"I didn't think they built basements back then," Graham says as the two of you go down the old rock steps. Walking down you notice the corridor narrow and widen as it takes you deeper underground. Bizarre and deep, you know that the altar must be located nearby. Eventually you and Graham walk into a large room, apparently carved out of rock, and see a simple stone altar with a pentagram on the floor.
"Holy shit," you say, how does it work?