Lapistia

/That could work. Or move three spaces down. That way, you can kill Raing with the black hole if you can reach him. Ideally, do it right away if he moves towards Karoline and puts himself in a vulnerable position. If he's already moved away, it doesn't really matter; you can probably just go up.
And yes, I still don't understand if the black hole destroys walls. If it does, I'd prefer to wait for Ples's approval and then maybe cast it./