Staring at the altar, you turn to Graham. "We gotta try it, dude. Is it something you want to do?" you ask.
"I...I don't know. I didn't believe something like this could even be real, but, but it is!" he exclaims in excitement. "I can try it first if you don't want to."
You think for a second, "well, okay," you say. "I don't know how it works, but maybe we can make out something on the altar."
The two of you walk closer to the altar and Graham excitedly dusts off wording around the pentagram. "Holy shit," he says, "they're incantations! I think, look..."
You see incantations of various spells on the altar, some that are labeled to incant when making a sacrifice, others are labeled to incant without sacrifices. "Which one should I pick?" Graham asks.