User blog comment:B214/Question and Answers 6/@comment-106.68.232.55-20161011071720/@comment-29890029-20161011103039

Midgardsormr is always sleeping, I doutb he is the 2nd strongest. Same for Yu-long who is lazy and is the yongest dragon king. Being lazy make you weak. Well... I dont have anything to go with. While tannin has the queen piece (if were counting that).

Maybe something like that :

6. Vritra

5. Midgardsormr

4.  Yu-long

2-3. tannin and fafnir

1. Tiamat