Makes it so heat doesn't flow to him

A violent tremble went through the dark matter, causing a shift. Things began to rise from the darkness, taking shape and twisting into something solid as Gilgamesh’s body took shape once more. Despite being exposed to even greater heat than before, this time he didn’t melt, didn’t even burn. No, looking at him with my senses, it was more than that, feeling somehow similar to the portal but different. It was as though the laws of thermodynamics had made an exception for him and chosen to ignore the fact that heat flowed from a hotter location to a colder one. The impossible atmosphere I’d made within my isolated section of space simply refused to touch him.