Draconis

Draconis is a member of an ancient species which is theorized to be  the ancestor of multiple reptillian kaiju species such as the skullcrawlers and  godzilla.

Draconis fossils have been found in antartica nearby ghidorahs frozen body, suggesting that it froze ghidorah then and there. it has been confiremd it was capable of freezing threats and prey by using a sort of ' nuclear ice ' a potent mixture of frozen irradiated water which the beast drank and due to this water being in the artic and irradiated by draconis's breath, would have been stored in a special compartment with extremely low temperatures  and  would turn into irradiated ice within seconds   and could be used as a potent weapon.

habitat and extinction
it is theorized draconis lived during the period of  time when  antartica was a lush area with diverse wildlife and lush jungles, after millions of years the  ice age it went into its slumber in the hollow earth and came out during the period of the ice age when most of its species were extinct when it went toe to toe  with king ghidorah , using all it's provess it overpowered ghidorah and froze it before succumbing to it's wounds itself. the alpha titan's actions were in vain as ghidorah would breal out and cause the extiction of the species of gojira, an ancestor of draconis.