From Introduction:
The flames coalesce into the form of an elemental unlike any other you have seen or read about. They do not swirl in a loosely humanoid torrent or crackle and dance like a campfire. Instead, the fire focuses into a dense mass of pure, volatile energy. It takes shape, violent expulsions of fire binding into the forms of arms, and a vicious, chaotic face appearing above its core. The center is almost solid, like a tornado of burning, spitting plasma.
Around this form, you see the air itself quiver and burn. Waves of heat wash outwards, catching alight anything that is remotely flammable. Showers of embers spread flames below its every step. Sweat beads across your body. Even at this distance, you feel that moisture singe your skin, almost evaporating in the heat that caused it.