You can fight a hidden level 30 Kraggon Boss named "Iwajira", that resembles Godzilla, has a similar radioactive beam attack, and is named closely to her original Japanese name, "Gojira". From Janey's Workshop at Serenity's Waste, run forward and use the U-turn to your right. Jump to the rocks on the left of the tall building up the hill. Use them to jump on the edge of the building. Follow the curved ledge to reach a narrow platform above some magma. Jet jump from high ledge across the streaming lava and land on the small platform on the other side. Enter the cave behind the streaming lava and continue deep inside until you find a hole. Drop into the cavern to enter the "Pyroclast Grotto" and encounter Iwajira.