Bromine Lake is a lake that is almost a very small inland sea. It is also special for other reasons. It always has the warmth of a living Human, no matter what the season. It is not a hot spring with its sulfuric chemicals. There are hundreds of theories, but no answers.
Even if they did, they would never believe it, as it has ties to the time of legends, to the time of Corvus.
The Akhal-Teke is a real horse breed that develops a metallic golden coat. A more fantastic version could have a coat the color of pure gold, or silver making the horse appear to be made of the precious metal.