Wang Teng and Nihility were two worlds apart at the moment. It would be impossible for the former to reach the Darkland, even if he exhausted all his space power.
They were too distant, making his spatial capabilities insufficient.
Of course, he could give it a go if he had enough space stones.
Second, they would need to exchange positions, unless they were close by.
They were basically space nodes. If Wang Teng teleported to the Darkland and Nihility didn't switch to where he was, they would have to stay there and find other ways to return.
Hence, Nihility had to leave when Wang Teng went over.
Besides those two points, there were more restrictions.
In a nutshell, the connection was a good thing, but they couldn't use it however they wanted.
Since Nihility had left, Wang Teng stored the corpse of the Obelisk Scale Dragon Beast into his Devouring Space.
