According to Rhys, all Miata said was that only she could pull off the magic for some reason. Even though half of us here are magic-users or literally made of magic. [ADDING TO THE SALT LEVEL HERE...] You'd think she at least have mentioned how it worked just in case she got put out of commission, but noooooo....

Yeah, I'm with you on that one. They only got Leviathan to agree by giving her their 'energy', which sounds super sketchy to me. If we're making a demon that much more powerful, what's to say she won't turn on us after she's done with the rest?