Cam is dipping a grilled cheese sandwich into a bowl of tomato soup when he feels the summons. He goes ahead and grabs it. Doesn't even drop the sandwich.
"...We should probably sit down and explain our universes to each other," she says. "At some point. When I'm done making things out of chlorophyte."
"It's one of the rarest and most useful kinds of ore and it's a huge pain to mine, although not quite as huge a pain as hallowed bars because it doesn't strictly involve killing terrifying monsters," she says.
"I can just make those directly, incidentally. Unless that will make them not count according to Terraria unphysics. It's also possible I know of materials that are better than anything you can dig up here - unless, again, unphysics. Would the NPCs be able to tell?"
"If you make some of whatever material you want to check and show it to a guide, he'll tell you what you can make with it, but I can sometimes invent things the guide hasn't told me about. We can experiment."
"I mean, at least in a local sort of sense things seem to work on normal phyiscs when that's how they start out. When I encased the harpies in gold they fell; my wings still work; conjuring up your lunch was normal. Will the guide say whether, say, titanium, is better than chlorophyte, or just tell us that you can make armor out of it if you want?"
"He'll just list off all the recipes he knows about that include whatever you just handed him. He doesn't say how good they are. But tools sort of 'know' how good they are, so if we actually made one, we could find out that way."
They're overflying the island now, and up ahead there is... a house. It appears to be floating totally unsupported in midair, fringed with wooden platforms. Sable lands on one.
"In Terraria," says Sable, with ironic cheer, "when you build a structure out of blocks and mine out the parts connecting it to the ground, it doesn't fall down."
"It has a logic all its own - you can't place an unsupported block, but once a block is placed, what holds it up isn't its neighbours, it's... something about the invisible grid."
"Which is also very video-gamey. I will show you some super dated video games and we can see if you think it's creepy."
She opens a door in the side of the house and folds her wings neatly and steps inside.
This room of the house is full of things. A table with a bottle on it; a small bench; a forge or fireplace plated with some bright metal; an anvil, a sawmill, a loom, a large iron pot, an extremely complicated-looking desk, a barrel with colourful glass tubing attached, a bookcase...
"Right, about that enormous pile of chlorophyte?"
Cam makes an enormous pile of chlorophyte, arranged vertically so it will fall into itself.
"You can have the tools," she says, waving at them. "If you want a set. The pickaxe mines blocks that aren't wood, the axe mines blocks that are wood, the hammer takes down thin walls and reshapes blocks. Hammers also have weird specialized uses you probably don't need to care about."
Cam takes some tools. "That was fast. I'll take the tools, I suppose. What is the advantage besides cool factor of having a floating house?"
"Walking corpses can't bang on the walls at night. The eyeballs can, but they're quieter."
"I should probably make myself a house. I guess I should put the entire thing on a support structure of floating blocks. Can a block hold arbitrary amounts of weight?"
"...I have no good way to test how much ordinary weight a block can hold," she says. "Not at house-sized amounts. Do you not want to make your house out of blocks?"