Does gravity onium really exist?

The most common use of onium in chemistry is the cation obtained by hydrogenation of mononuclear hydrides of nitrogen, oxygen and halogen, which is called onium compound. Gravitation is the translation of imaginary particles in physics. This is basically close to the setting in the comic book. But this thing is just a hypothesis. As for the reality, no one or tool can manipulate the gravity field within tens of kilometers of Fiona Fang like F in the cartoon, create a black hole out of thin air, and launch this virtual particle as a particle stream as an attack means.