In the end, Liam didn't even think of being nice to his little sister, let alone being gentle with her creation.
What he did on the first basement was just the beginning, and the basalt walls in the maze of the second basement were bound to meet the same or more gruesome fate real quick.
He retrieved the Keychain of Miniature Tools and enlarged the Mining Pickaxe once again.
There were a few things that attracted Liam's interest on the second basement floor and he intended to take a look at all of them.
He didn't really care about the maze walls, which left behind the monsters and traps as the only nuisances.
Of course, that didn't mean the basalt walls of the maze weren't noteworthy obstacles. They still were in his way, obstructing Liam and the natives from finding a way through the huge maze, by shifting and changing the paths every now and then, driving the beings that dared to enter it insane.