Kalama is 30 feet at the shoulder with scales that are inches thick, with breath hot enough to melt the armor right off of a man. When a dragon is 50000 years old, it means they have godlike levels of power. Not even the Dragonborn from Skyrim could take down Kalama as he is here (especially since the Dragonborn is accustomed to pushovers), and this is him weakened greatly so he would be acceptable for RP.