"Archomentals are primordial elemental beings of great size and power. Some (such as the Elemental Princes of Evil) are named and worshipped, while others are nameless and unknown outside the elemental planes. Fire archomentals have been sought after and imprisoned by dwarvish nations as their heat is hot enough to fire an effective forge for working adamantine. Not surprisingly, they highly resent being bound up, and wreak catastrophic havoc if and when they are released.
A fire archomental resembles a gargantuan (50-foot-tall) humanoid or multi-limbed beast made of a mesmerizing blend of raging flames, billowing smoke, and swirling embers, constantly shifting and flickering with an otherworldly intensity. Its colour varies from deep orange-red with greyish smoke, and blazing yellow highlights to golden-yellow with searing yellow-white flames depending on its firepower. Wherever it moves, it sets its surroundings ablaze, turning the world to ash, smoke, and cinders. As the archomental’s Firepower increases, it visibly appears to produce more flames from its body, becoming a searing yellow to white-hot. Regardless of intensity, its eyes are smoldering black pits."