I'll be blunt: This was very poorly written even for a Fan Expansion. I wasn't expecting anything on the level of @
GoldenYak--look him up on the forums since you clearly don't seem to know about him--but it's obvious you didn't put a lot of thought into this. The idea is intriguing but the problem is it was clearly not clearly thought out. Use Wowpedia (website) for info.
Oh and Cataclysm was not a "Dragon" Expansion. Yes, Deathwing was the final boss but there was other enemies in that expansion. We know the Old Gods were pulling the strings in regards to Deathwing and then there's the Twilight Hammer. Let's not also forget the returning Ragnaros and the rogue Aspect of Air in Uldum. The War of the Ancients--which involved the Legion--is where we go to retrieve the Dragon Soul. Thrall is empowered as the Aspect of Earth as well.
On the one hand I do agree the former Aspects' story is over. Of the original Aspects, only Alextrasza and Nozdormu are still alive. We kill Neltharion becomes Deathwing who we kill (lorewise, the Alliance kills him). Malygos is killed in Northrend after going mad and his son Kalecos replaces him as Aspect of the Blue Dragonflight. After Deathwing is killed, Kalecos disbands the Blue Dragonflight which I think you overlooked. As most know, Ysera dies in Val'Sharah. She is revived by the Winter Queen in Ardenweald but the caviat is she can never return to Azeroth.
Alextrasza even after being depowered is probably still the most powerful dragon alive. After Hour of Twilight, all of the Aspects lost the ability to reproduce and I'm assuming that also applies to the Dragonflights as a whole. The Bronze Flight can still travel through time but they can no longer see the future with clarity. We do know thanks to WoD that the Bronze Flight can still find alternate timelines for not just Azeroth but other worlds. Even though they're not as powerful, they continue their charge as stewards of the timeways.
...Moving on. Let's flesh your concept out a bit more, shall we?
Expansion Story
While the Horde and the Alliance were busy dealing with threats of the Shadowlands, two long defeated foes have joined forces. The Twilight Hammer and the Cult of the Damned join forces to greatly boost their power and get revenge on their enemies starting with the greatly weakened Dragonflights. The five Dragonflights were once the most powerful races on Azeroth. The Aspects, who were blessed by the Titans sacrificed their power to stop one of their own who had succumbed to madness.
Despite having just gotten the crisis from the Shadowlands under control, the Alliance and the Horde respond the former Aspects' call for aid in their time of need. Aided by mortal heroes, the five flights come together and form the Wymcrest Vanguard. Now is the time for them to take the fight to those who seek their extinction. To thank the mortals who came to their aid, the Wyrmcrest Vanguard raises the Dragonsworn. The Dragonsworn is a Hero Class that uses the Red Dragonflight as a base but is imbued with the power of all five flights.
The Twilight Hammer and the Cult of the Damned--now calling themselves The Twilight Enclave--is backed by new masters who have opened the way to the mythical Dragon Isles. The Dragon Isles was one of the few regions on Azeroth that hadn't been revealed by the Cataclysm. Now exposed to the world, terrible power threatens to destroy all life on Azeroth. The race is on to stop the Twilight Enclave and reseal the Dragon Isles before it's too late.
Pre-Expansion Event: Dragon's Roar
The Twilight Enclave is targeting dragons who have been living among the mortal races. Alextraszsa reveals The Twilight Enclave has learned from capturing and tourturing Dragonkin how to unseal the Dragon Isles. It is a place considered sacred to all Dragons that no mortal could find our enter...until now. The race is now on to find five dragons who hold the key to unsealing The Dragon Isles before the Twilight Enclave does. The seal, which had been placed before the events of the War of the Ancients has persisted despite all that has happened in the millenia since then.
You will have to find a dragon of each flight in five zones in five familiar areas, some of them depending on your faction:
- Ironforge (Alliance) or Thunder Bluff (Horde): Alliance Players will seek out a blacksmith in Ironforge who is really a Red Dragon. He has one more job to do before he can leave though. The Twlight Enclave is on the move and you must defend him while he completes his last job as a Blacksmith. Horde Players will seek out a guard in Thunder Bluff who is really a Red Dragon. The Centaur have united and invaded Mulgore as far as the gates of Thunder Bluff. Someone powerful is directing the Centaur. You must find out who and slay them before the Centaur breach the city.
- Kun Kai Summit: A Green Dragon disguised as a Pandaren has gone missing somewhere in the mountains. The Shado Pan have already started a search since she was one of theirs but you must find her before someone else does.
- Azure Watch (Alliance) or Suramar City (Horde): Alliance players will seek out a Draenei Mage in Azure Watch who is really a Black Dragon in disguise. She was sent by Wrathion investigate the Twilight Enclave, who seem to be up to something on Bloodmyst Isle to the north. She was just thinking of finding some help but since you came, that's no longer necessary. Horde Players will seek out a Nightborne Warlock who is really a Black Dragon in Disguise. He was attacked by agents of the Twlight Enclave who are still hiding somewhere in the city. They took items of importance and you must get them back.
- Icecrown Citadel: Kalec tells you he lost contact with a Blue dragon disguised as a Death Knight who was among the Ebon Blade. You travel with him him Acherus where Darion Mograine reveals The Twilight Enclave forced their way into Icecrown Citadel and they seem to be looking for something. Bolvar locked down the area but they lost contact with the strike team sent in to wipe them out. The Death Knight you're looking for is a part of that team.
- Caverns of Time: The Twilight Enclave launch a massive offensive to wipe out the Bronze Flight. You arrive to find the Caverns of Time is overrun. Help the Bronze push back the invaders and protect their lair.
After completing the five quests--you can do them in any order--the Wymcrest Accord reforms as the Wymcrest Vanguard. Wrathion proposes they share their power with the mortal races since their help will be needed for the coming challenges. They decide to set off for Grim Batol, which was abandoned by the Twilight Hammer some time ago to make it their base.
New Class: Dragonsworn
The Dragonsworn is new Hero Class that utilizes the power of the Red Dragonflight as a base. Dragonsworn wear Mail armorIt is the second Class after the Druid Class to have Four Specs, each based on one of the other Flights:
- Talonguard (Tank): By harnessing the power of the Black Dragonflight, the Dragonsworn becomes a mighty bulwark to keep their allies safe and draw the enemy's attention. Uses Rage as a resource, wields a 1H Weapon + Shield.
- Timeweaver (Melee DPS): By harnessing the power of the Bronze Dragonflight, the Dragonsworn is able to attack enemies with quick but powerful melee strikes. Some abilities change depending on weather you're using one 2H weapon or Dual Wielding two 1H weapons. The Dragonsworn is also able to strenthen allies and hinder foes. Uses Focus as a Resource.
- Magiknight (Caster DPS): By harnessing the power of the Blue Dragonflight, the Dragonsworn is able to wield powerful magic to devastate enemies and aid allies. Uses Mana as a resource.
- Dreamweaver (Healer): By harnessing the power of the Green Dragonflight, the Dragonsworn is able to mend the wounds of allies and in some cases prevent damage entirely. Uses Mana as a resource.
Dragonsworn are a Hero class and starts at level 15 like DKs and DHs. In addition to their own unique land mount, they also have two unique travel forms based on the Red Dragonflight that are both rideable by another player.
The Dragonsworn can be of the following races at the start of the expansion:
- Alliance: Human, Dwarf, Draenei, Worgen, Dark Iron Dwarf, Kul Tiran, Lightforged Draenei, Pandaren
- Horde: Orc, Tauren, Undead, Troll, Highmountain Tauren, Zandalari Troll, Nightborne, Pandaren
Dragonsworn will begin in a phased version of Wetlands where they learn their class and also put a stop to the Twilight Hammer's attempts to infiltrate Grim Batol. At the end of the Quest chain, you're sent to Orgrimmar or Stormwind.
In a later content update, the following races will have access to the Dragonsworn Class after completing a certain quest chain per faction:
- Alliance: Night Elf, Gnome, Mechagnome and Void Elf
- Horde: Blood Elf, Goblin, Mag'har Orc and Vulpera
Dragonsworn of these races will go through a phased version of Feralas which will reflect events of the expansion up to then. At the end, you're sent to Orgrimmar or Stormwind.
Battle The Twilight Enclave Across Azeroth
Upon reaching level 58+, heroes of the Alliance and the Horde will be summoned to the Wymcrest Vanguard's new base in Grim Batol. From here, you will aid the Vanguard and the Dragonsworn they've trained in their war against the Twilight Enclave across Azeroth.
- Northrend: Taking advantage of the recent conflict in the Shadowlands, The Twilight Enclave has seized control of nearly half the Scourge and is using the undead working to build a fleet of ships to wash across Azeroth. If that's not bad enough, the Twlight Enclave is also working to raise Galakrond. Bolvar and the Ebon Blade have their hands full keeping the rogue Scourge contained to Northrend so it's up to you to break the deadlock.
- Pandaria: Something has arroused the Mantid Swarms, which had been dormant since the Pandaria Campaign many years earlier. To make matters worse, the Yaungol are also on the move. You must help old allies face these challenge and find out what caused them in the first place.
- Broken Isles: The Twlilight Enclave devised a covert attack in Suramar City not that long ago. Now they are back in much larger numbers looking to plunder the denizens still recovering from the Legion invasion.
- Eastern Kingdoms: The Twilight Hammer is seeking allies and power across the continent. Aid some familiar faces in their efforts to beat the Enclave across the continent.
- Kalimdor: The Twilight Hammer is seeking allies and power across the continent. Aid some familiar faces in their efforts to beat the Enclave across the continent.
You can do these quest areas in any order. There is a story quest chain for each landmass that involves specific zones but there are additional sidequests that will take you into other zones. Doing them provides additional story content and rewards, reputation and experience that make them worth doing.
Max Level Zone: Dragon Isles
After stopping the Twilight Enclave's plans across Azeroth, the time has come for you to enter the mythical Dragon Isles. This isolated archapelego is home to many exotic flora and fauna and populated by Dragonkind in mortal guises. The Wymcrest Vanguard has enlisted the aid of the various factions you encountered across Azeroth to build a a base as well as outposts across the isles at key points. You must find the means of restoring the Dragon Isles' barrier before the Twilight Enclave can bring their horrible plans to fruition!
New Feature: Power of the Aspects
Harness the power to the aspects in your quest to defeat the Twilight Enclave and aid the Wyrmcrest Vanguard. Make use of Dragonshrines across the world to grow in power and make use of power wielded the five flights.
...Whew. I feel like I wasted the 6 hours I spent writing this but I hope this gets your creative juices flowing at least =P