Got a lot of constitution :']

Here's a little fact about Grom. He actually has no typical organs, bones, or muscles. He runs completely on intense arcane energy. Even his skin isn't typical flesh. He either has magical parts that are similar to organs in his body or just magical energy floating around. His "fat" is just massive arcane energy that manifests in a fatty like form. The more you know.

Credit goes to artisipancake