NameOrigin-This dragon has been known to swallow flammable objects,likely to keep its digestive system heated at an even temp(450degrees)
Diet-Usually some sort of stone or metal,it has been known to favor gemstones such a diamonds & rubies,it refuses to eat sedimentary rock unless it cant find anything else
Over the span of a Coalbringer's lifetime lava in its stomach lines the walls of of its digestive system,slowly hardening until it eventually suffocates or starves the dragon.