Talk:Boros/@comment-29947090-20180606194411/@comment-24411065-20180814125704

Since Boros isn't officially a God-level threat (hasn't been labelled as that despite his powers / abilities supporting the idea), and since he is clearly much, much stronger than typical Dragon-level threats. People refer to him as Dragon+.

That's all it means. It's hardly inventing a new term. It's just people referring to him in a way that makes it clear he is considered higher than most Dragons without officially being God-level.