There is apparently no connection between Ging and Hisoka as the latter was brought up with a circus crew and learnt Nen from a circus master, while Ging had a family. Since childhood, Ging was a prodigy and was curious to know the secrets of the world which are unseen or unknown to normal beings.
Hisoka is interested in very strong and powerful people he want's to kill them, so he's inetrested to Ging Freecss and Isaac Netero, Gon Freecss is he's most interested to, because Hisoka is very strong and powerful that he can see how strong and powerful a person is as seen in the election arc, Hisoka was just amazed
So. We start where we left off last week. God's dying, which leaves Amara free to end all of creation because the cosmic balance between light and dark has been destroyed. And when the light outside starts to dim, it becomes clear that Amara's going to end the world by slowly killing the sun.
Definition of supernatural 1 : of or relating to an order of existence beyond the visible observable universe especially : of or relating to God or a god, demigod, spirit, or devil. 2a : departing from what is usual or normal especially so as to appear to transcend the laws of nature.