So far, in my opinion the forum does not require a new ranking after Legendary. Maybe the award will be more suitable for those who have reached the Legendary rank. The badge might also be quite good as a form of appreciation given by the forum for the Legendary profile which managed to get a minimum of 1000 merit with customized activities and posts.
Excample:
Legendary I with 1000 merit, 775-1030 activity and 1030 post
Legendary II with 2000 merit, 1550-2060 activity and 2060 post
Legendary III with 3000 merit, 2325-3090 activity and 3090 post

This is only a suggestion, but it is very annoying when I want to reach the badge 3rd Legendary with 3000 merit.