More rank 20 dungeon please!

[Rokien]

The rank 20 dungeon is the best one out the 3 so far. It has 5 different levels(wish those levels would increase in mob difficulty). There's more to do in that dungeon than the rank 50 one. When ever I did the rank 50 dungeon you would just run through it, quickly open the chests, kill the two bosses. There is nothing to that dungeon, I think its because of it being instanced.

list of what I like about the rank 20 and 50 dungeon

Rank 20 dungeon:
-Has more to it
-Meet new people(party up with strangers)
-NMs that you have to do certain things to make em pop(from what I understand)
-Chests that have random drops(HAVE TO BE OPEN BY KEYS)<---big thing for me.
-Different level of chests(rare keys to common)
-Multiple floors
-Not instanced
-Fun and thrill of the hunt(claiming the nm)
Rank 50 Dungeon:
-hard NMs
-chest(don't require keys)<---is a bad thing, makes it where you can run through it an not enjoy the dungeon at all.