As long as the smoke has a vent to escape from within the pit, then we can use those rocks. I have quite a lot...

( they're sitting in a bag in his room as he watches the blue then the white sprinkle and mix together, because of the snow. )

I retrieved Rokkun's gift out of them, so I don't need the majority anymore. We'd have to place them together into masonry blocks, though.

( he'll light another one, watching the item spin off the rooftop with the others, and once it hits the ground, there's three of them twirling about, but not as fast as the third. )