Hammergrim
The party presses on, some continuing to stare at their surroundings, others focused on their goal. The distance to the hovering sphere is covered quickly, though nothing especially extraordinary can be noticed about it beyond the fact that it's hovering about a foot above the surface of the cube. Looking at it, there's no obvious means of activation. However, as soon as one of their number touches its surface, a chime issues out from it; a single note, echoing around them, as space seems to distort and ripple about them...
Mines of Marsellin
...and take them somewhere else. They still stand atop the face of a large iron cube, but this one is much more pitted, holes and pits all across the surface. The sounds of mining work fill the air here, drowning out the occasional smashing of two cubes in the sky above. Despite the mine-work, no piles of tailings can be seen dotting the landscape; in a place where the ground itself is iron, even creating a tunnel can create useful products, after all. Of course, that doesn't mean the view is entirely flat. The occasional statue of black-iron, matching the rest of the cube, is a dire reminder of what happens to those who dally too long here.
This cube is a good deal more active than Hammergrim as well; even just the area around this portal has three separate groups of miners the six can spy, each no more than a couple hundred feet away. In one direction, the group of six can see a man-sized cube with a set of spindly limbs and a human-like face ordering around a set of upside-down pyramids with similarly spindly limbs as they head in and out of a tunnel, carting empty boxes in and full boxes out; how many, you can't be sure, as these pyramidal beings are utterly indistinguishable from one another. Another direction, a two-dozen-strong group of humanoids - humans, tieflings, and a pair of dwarves - works, climbing out of a second tunnel in the cube. A well-armed group, they lead a large, harnessed, somewhat insectile-looking creature with long antennae carefully out of the tunnel, gently nudging it into walking across the ground. And in a third...fiends. A half-dozen small, spine-covered, winged, reptilian...things, bounding over the surface of an open pit-mine, swinging picks at the "earth" with purpose, collecting chunks of iron in sacks swung over their backs, their red eyes flickering as they focus on their task.
First group
Gulrd, Lux -
Second group
Lorraine, Lux -
Gulrd -
No one knows anything specific about the third group.