Fun idea!

[HeroSamson]

There is something that taito did in Lufia 2 that would be pretty awesome in FFXIV.

The 100 floor dungeon it goes like this.

1. You go in as level 1, you have no gear except a level 1 weapon your gear is left in a holdbox till you either die or return outside.
2. You find chest to gear yourself but you can't keep the gear, the only gear you can keep is from a Blue treasure box.
3. Every 10 floors is a providence which warps you out of the dungeon if you lose all your teammates but get to keep blue chest.
4. Blue chest in higher floors have better weapons, gear and items.
5. It also involves a quest to collect a set of armor and you get rewarded if you finish this task.

It doesn't save your progress so if you die you have to climb again, you would have to keep going in order to reach 100 but in ffxi they could change that to if you reach 35 floors it saves but if not start over.

Or

A survival dungeon where you keep fighting monsters and seeing how far your team can get until you die and it saves your record but if you get far enough you get prizes and people can break your record. make armor and weapons invincible while you are inside also no spirit bonding make a prize where you can 100% spirit bond a item make it rare.