The Kingdom of Archaea

The word archaea comes from the Ancient Greek ἀρχαῖα, meaning "ancient things"

Fairly recently we've discovered entirely new form(s) of life, which biologists tend to be matter of fact about, mostly because we don't really understand them very well. An entirely new kingdom of life that is adaptable enough to live in both the deep earth "hot biosphere" in extreme heat and pressure and to metabolise ammonia and sulfur, and are also found… in the human intestine.

> Despite a morphological similarity to bacteria, archaea possess genes and several metabolic pathways that are more closely related to those of eukaryotes, notably for the enzymes involved in transcription and translation [codes for bio material]

Archaea are part of the microbiota of all organisms. In the human microbiome, they are important in the gut, mouth, and on the skin.

No clear examples of archaeal pathogens or parasites are known. Instead they are often mutualists or commensals, such as the methanogens (methane-producing strains) that inhabit the gastrointestinal tract in humans and ruminants, where their vast numbers facilitate digestion.

Archaea are genetically distinct from bacteria and eukaryotes, with up to 15% of the proteins encoded by any one archaeal genome being unique to the domain, although most of these unique genes have no known function

Archaeal energy sources are extremely diverse, and range from the oxidation of ammonia by the Nitrosopumilales to the oxidation of hydrogen sulfide or elemental sulfur by species of Sulfolobus, using either oxygen or metal ions as electron acceptors

Smaller independent pieces of DNA, called plasmids, are also found in archaea. Plasmids may be transferred between cells by physical contact

https://en.wikipedia.org/wiki/Archaea#

There's lots of life in the deep hot biosphere, archaea and perhaps more complex species such as fiery salamanders, rock eaters and the mysterious and fiery seraphim that populate scriptural revelation, folklore and myth.