[Suggestion] Hidden/Secret Dungeons

[Anima]

I've been thinking a lot lately, about what will spice the game with {Fun} and {Excitement} and I think Hidden Dungeons or similar things would be really awesome to see.

A "Hidden Dungeon [Open World]" would be cool to implement. SE could just tell us that a/# Hidden Dungeon has been implemented but doesn't tell us where or what is it or what monster awaits. Maybe just say "Great rewards awaits to those who are able to find and unravel the mysteries within"

When I think of Hidden/Secret Dungeons, I think about those 100 Floor towers, dungeons which is very difficult, lots of hidden bosses, lots of different paths to take which leads to multi-endings, dungeons with lots of traps like in Pyramid or tombs, dungeons which will take very long to finish, Sky Islands, Sea Kingdoms, Sunken ships, Abandoned Hi-tech ruins, etc.

An example of dungeon from FFXII is the Tomb of Raithwall, Sky Fortresses(Airships), Underground sewers(and many more!), or 100 Floor towers from various SE's games, Crystal Chambers/dungeons, FF: 4 Heroes of Light also has a few interesting places, FFX has lots of interesting places, and I think other FFs has lots of interesting places too. Dungeons like the one in Zelda series are really fun to play too! or White Knight Chronicles~

Here's a good Link to a Thread(Dead) which has lots of suggestions: Traps, Gadgets and Dungeons

The Mysterious aspect of it will add the excitement for trying to search and instead of standing around in town doing nothing, people can put up a Search party for the Hidden Dungeons. SE can even add Hidden Portals throughout places in the world such as caves, trees, temples, statues, etc. It would be even more interesting if SE added Lore to these, make use of the "Echoes" in the world's Lore because Story that involves Time, Paradoxes, etc can be very interesting.

What do you think?