"So that was their plan. The two of them really had thought of the same thing, meow."
Back in Sugar Bean's Dream on Earth-0, Kitty watched the surveillance footage being relayed by the Adjutant, studying the two women within with great interest.
"They want to borrow the Cosmic Tuning Fork from Earth-0 and use it to create an enormous dream, just like when Barbatos trapped the Superheroes."
"Ah, I called that process 'hanging them from the tree.' Heh heh."
Watching the two women discuss their plan as they walked, their sisterly bond mingled with mutual interests, Su Ming drank his soda and nodded with a smile.
"Their plan is feasible, and quite clever. With the Tuning Fork, as long as they are a little careful and do not let it tear apart the barriers between universes—such as punching a hole through the Orrery of Worlds and upsetting the balance between the light and dark Multiverses—it can be done."
Yes, the Tuning Fork could be used, but there were quite a few precautions. That thing was, after all, a Superweapon made by the Anti-Monitor, originally intended to stir the Multiverse into a puddle of nutritious mush.
Hanging people from a tree, plunging them into Nightmares, and charging the Tuning Fork with them was another use invented by Barbatos and The Batman Who Laughs.
Still, sometimes bad things could become good things. That method could indeed now be used against Nightmare.
A person could only be trapped in one Nightmare at a time. If they were already caught in the nightmares Bliss had woven for them, hearing, seeing, and dreaming of all sorts of insane Batmen, then they would not dream of the Sleepless Knight, nor would they become breeding grounds for Nightmare.
With Bliss and Cindy's skills and willpower, along with