We had passed through long walls of piled skeletons, with casks and puncheons intermingling, into the inmost recesses of the catacombs.
"as was my in to smile in his face, and he did not perceive that my to smile now was at the thought of his immolation."
"Then you are not of the brotherhood. You are not of the masons."
"producing from beneath the folds of my roquelaire a towel"
this shows setting because it's giving details details of whats there and what it looked like inside also where they were in.
This creates mood because hes looking at fortunato and thinking inside his head of killing him while hes happy and smiling.
This is showing verbal irony because fortunato is asking Montresor if he's one of the masons like part of a secret society. Montresor thinks he's asking him about the other meaning like a builder and worker in stone so he says "yes, yes". He's saying he is so he shows him a trowel.