PT has been the most fun I had in this game for a while.

I think bringing the challenge log into older deep dungeons (after they have received the qol) would be a great idea.

I wonder though what could be good rewards from the log to make them interesting in the long run and not simply "get rewards and don't go in ever again".
Random treasure coffers that can have basically anything inside? From old Ex weapons to submarine rewards? (Maybe even a low chance for Fantasia?)
Would be really interesting what others think regarding this because I think that might revive a lot of old content if done right.