After capturing the being behind the scenes, Lena was very cautious and did not choose to bring it into her world. Instead, she selected one from the many "empty" worlds on the World Tree.
Considering what Miyuki had mentioned earlier, these beings behind the scenes might fear Miasma, so Lena intentionally did not choose those worlds that were completely corroded by Miasma to make the situation worse for her.
However, even so, when Lena brought the being behind the scenes into a world with a relatively low degree of Miasma corruption, the spider-like creature let out a whimper, as if enduring some pain when it was released from the black hole.
