Just removing telegraph and making everything more impactfull if failed would be more than enough to make 4man a good casual end game challenge.
Personally, I really love the concept of Mythical dungeon in WOW and, without necessarily making it an exact copy, it would be a great addition to the game.
http://www.wowhead.com/mythic-keysto...dungeons-guide (for info)
Just removing telegraph and making everything more impactfull if failed would be more than enough to make 4man a good casual end game challenge.
They could make those as some kind of weekly event. Every week having a dungeon boosted to "Savage" mode.
I really like the concept of difficulty level. Without using the same area of effect from WoW (even though these are great as they change the way you approach the dungen), I believe some aspect of FF could be used to increase the difficulty in unique ways.
For instance, let say there are only 5 difficulties level for the sake of simplicity. Every level obviously grant monster more HP and Dmg but, with something new on top of that
1- Simply more hp and dmg (biggest bonus) let say everything starts at 130% dmg and bonus
2- Telegraph are removed
3- Dodgable skill deal more 50% damage.
4- Monster get a new skill or revamped skill (something simple increasing difficulty without requiring costly coding). For instance, in the library, the mage casting the water explosion, the explosion would recast itself periodically over 30sec (like every 10sec
5- Bosses and Trash have enrage timer.
Stacking all of these over a steady hp+dmg buff on monster, would make 4man much of a challenge.
As patches go on, the hp and dmg buff would be increased accordingly making them always relevant. It is important to note that those would be end game content and not a new mean to gear up your character.
These would bring gear ranging from better than normal 4man to better than normal raid but worst than savage raid (for obvious reasons).
I stress the "the last difficulty, granting better than normal 8man gear" MUST be way harder than normal weekly 8man roulette
Example of rewards : let say the current high lv 4men grants 300 ilv gear and current normal raid grants 330 ilv
At the end of every level you pick between 2 bags
1a- Grant one 300 ilv equipment + gils
1b- Grant more gils, tombstone
2a- Grant two 300 ilv equipement + gils
2b - Grant more gils, tombe stone
3a- Grant one lv300 high quality (320 effective ilv) + gils
3b- Grant more gils, 1 random high lv materia, tombestone
4a- Grant two lv300 high qyality + gils
4b- Grant gils, 2materia, tombestone
5a- Grant one lv 340 piece of gear +gils
5b- Grant gils, 2materia, tombestone, random glamour stuff (pet, house stuff)
The gear could come in a form of a token, that can be traded at a vendor. (effectively 3token type), the gear would only be 5 pieces of set and weapon (no ring belt etc).
They could either go with an entire new set attire, or simply take the one from 5men, and do color variation with possible special glows on the lv 340 piece.