This is the 6th and Current Highest Rank in Progress.For the Handful of people who have finished off the Grandmaster tasks. There is no current quest list yet so this is merely just a title.
For now can only speculate on which tasks would be here. It may either require an insane number of battles, arenas, shards, daily tasks or rewards and even ascending items. Not to mention gaining huge number or leg or even unreal+. So it's likely there would need to be something beyond these otherwise it seems they will be unlikely to be added.
Continuing the number of quests in each there would be 35 in total here.