Our only hope is that we somehow get one of them to taste the blood of at least one of the others...
Hopefully, the resulting reaction of Yuyuko inhaling Kirby, or some similar event, will be like putting a portable hole inside a bag of holding - annihalating a small chunk of reality in the immediate area, sacrificing a piece of the universe to save the greater whole from edification.
Honestly, out of all those present, I'd be most afraid of Kirby. Unlike the others, he 'has' shown a tendency to eat anything, everything, anywhere, everywhere.