let's be honest here but this dragon doesn't show up in vermithor, like the dagoes of got in my opinion don't look so aggressive that I can't imagine vermithor like that since he's considered sweet, for me this dragon there, looks like he's going to burn one whole city just because they will look at him crookedly, this one had to be another one maybe an egg that the mc takes and uses runes to make him stronger and bigger, faster and with strong scales to make him immune to dragon killing weapons.