>>36349160The 18,000 degrees thing isn't actually as bullshit as people say.
The comparison is always made that the "surface of the sun" is 10,000 to 17,000 degrees and thus Macgargo is somehow hotter than it, but that isn't correct. Those temperatures are just the atmosphere of the sun, the gases surrounding the chemical reaction occurring in the center. What we'd call the "surface" of the sun is the corona, which is where the plasma that makes up the sun is, and that's millions of degrees Fahrenheit.
In fact, there are many times where things on Earth can easily exceed the heat of the sun's atmospheric layers: in types of chemical reactions. So though actual magma on Earth (in the crust, at least) doesn't exceed a couple thousand degrees, it could be explained that the heat that makes Macgargo's body molten is actually some sort of continuous chemical reaction releasing massive amounts of heat that are insulated by its outer layer of molten material.