Yeah, I just can't see Uther become Lich King or even fall victim to corruption. Apart from that the rest looks good, and Grom should definitely become Lich King.
How about this instead: To involve Quel'thalas, have Jaina explain the situation to the high elves before the mission where she joins Arthas. Kael'thas agrees to help out, and joins in killing Kel'thuzad. Kel'thuzad haunts Kael (maybe the elves decide to keep his remains to be on the safe side, as they've been hearing rumors about humans turning to necromancy).
This can then open up new possibilities, like the summoning of the demon lords being a possibility again, trying to conquer the east before heading west for the World Tree, or even corrupting the Sunwell as they intend to do to Nordrassil.
As a side note, you should consider having a level playing as the Cult of the Damned to show how/why the cult took hold in the first place (taxation, conscription, people just losing hope...)
What will happen to Mal Ganis ? Arthas used Frostmourne to kill him .
^ Thing is, Arthas only went to Northrend because Mal'ganis forced him to murder an entire city. If the Culling doesn't happen I don't know if he really has a role. Maybe serve as agent between the Legion and Kael?
Quel'thalas continued (why do I only get ideas when I should be paying attention in class?): Jaina brings Sylvanas along to Northrend (in a cutscene, telling her that if Arthas starts showing interest in Frostmourne, Sylvanas is to shoot him dead), leaving Uther and Kael to stand guard.
Kel'thuzad starts corrupting Kael (possibly playing on his jealousy or having Arthas behave like Garithos Jr. towards him), helping him orchestrate minor demonic summonings across the kingdoms thanks to the Cult, possibly training other elves in secret to draw power from demons instead of the Sunwell. Uther has to stay in Lordaeron to keep them down, so Kael can cause more outbreaks in Quael'thas.
Eventually the elves hit on the idea that maybe keeping a dead necromancer around isn't a very good idea. Kael publicly agrees, and in a grand ceremony, purifies Kel'thuzad's ashes by... dumping them in the Sunwell.
Kel'thuzad returns as a lich, the Cult starts a massive demonic summon in the heart of Silvermoon, coinciding with the fel orcs attacking from outside. Once the city falls, Kael, Kel'thuzad and Grom head towards Dalaran for the book (or try to summon Archimonde from the Sunwell's ruins).
Interesting plot . What about Tichondrius ? We know that he was some kind of a guide for Arthas after he was corrupted . What would he do now ?
Do the same for Grom, I imagine. Though this might lead to more friction between them than with Arthas, since Grom doesn't seem the type to enjoy being bossed around (by Tichondrius or Nerz'hul).
Also, what can Kul Tiras do (apart from massive refugee fleets to Kalimdor)? Maybe Thrall and Jaina can try to settle the same city?
I remember that Jaina father , Admiral Proundmore hates the orcs .
Yes, so he can be counted on to stay in Lordaeron until the fel orcs are gone, and can prevent them from heading west if/once the continent falls.
Which brings us back to the naga. The Legion recruits them to break the Kul Tiras blockade or at least allow the three evil heroes to get to Kalimdor, in exchange for eradicating the night elves after (their mutual goal) and promising them all of Kalimdor once that's done (the latter, of course, the Legion has no intention of keeping).
More or less. If I remember the original lore correctly, the naga were the night elves who consorted with demons. If the Burning Legion came down and offered to basically bring them back to the power they had before the Sundering, I daresay they'd jump at the chance.
Okay, so: the Kul Tiras navy is both blocking anyone from fleeing the eastern kingdoms and making sure any refugees are able to escape. The naga are brought in to loosen the pressure so the three evil heroes can flee the continent, either by attacking the blockade or attacking Kul Tiras itself. If Proudmoore has to die it was as well be defending his own city (naga level?), though I think Jaina will try to arrange matters so her father doesn't die either.
As for Mal'ganis, Arthas meets him in the context of the dreadlord forcing him to kill his own countrymen to save them from a worse fate. If the Culling never happens, he won't be nearly as determined to hunt him down.
How about this: Jaina convinces Arthas (with Uther's help) that Mal'ganis isn't behind the Cult (I assume she's also prevented the whole plague zombie thing), and that it's important for him to stay in Lordaeron. Then they hear about Muradin, and then Jaina recognizes that if she can't keep him from going to Northrend, she'll make damn sure he doesn't turn into the Lich King. Uther and Kael stay behind, Jaina, Arthas and Sylvanas go to Northrend.
Thrall and Jaina: At some point Jaina should offer to help Thrall with trying to restore Grom (after all the Northrend/Kalimdor shenanigans). Possibly by having her father in on the meeting, with Jaina telling Thrall that if she doesn't help him, the Admiral will definitely kill Grom. Maybe she could put on the visions light show, he might be more inclined to believe him as a seer himself.
As for the dreadlords, there's an interesting alternate timeline mentioned in this campaign, where Mal'ganis is killed right after the Culling thanks to a cure for the zombieism. Tichondrius in disguise starts setting the nations against each other, arranging for Jaina to fight the orcs headed for Kalimdor and die in battle, then get Antonidas to believe Terenas arranged for her death (and Terenas to think the Kirin Tor came up with the plague). With Lordaeron and Dalaran at war, Archimonde is summoned much faster, and the Legion ultimately kills Illidan since Arthas couldn't tell him about the skull of Gul'dan.
Obviously not all of it's compatible with what's happening here, but drealords impersonating and infiltrating Alliance high command could make things interesting.
What about Lord Garithos ? Do you have plans for him ? Maybe you could make his a nice guy or something.
As for Garithos, he could play a part in the downfall of Quel'thalas, like being left behind by Uther to help watch over Kel'thuzad's ashes. He doesn't like the post, he doesn't like the people, and nobody likes him. So when Kael brings Kel'thuzad back, he should be the first to die. Or maybe Kel'thuzad could corrupt him as well, giving the Lich King two agents in Quel'thalas, or the dreadlords mind control him, or...
I have no clue who the Infinite Dragonflight are. Are they good guys or bad?
...Yogg-Saron is unopposed, and his corruption can continue, perhaps even seizing control of the scourge itself, and integrating the powerful titan and elemental powers he commands. This benefits the infinite dragonflight greatly, as their existence is dependent on old god corruption.
With the timeline splintered this badly, the Bronze Dragons would have no choice but to aid the evil forces. Either the Legion, the Scourge, or the orcs, to ensure a future where the combined might of Azeroth puts a stop to the old god's corruption in Northrend. I doubt they'd just fly a cadre of drakes into the battle lines of evil, so probably you'd see their aid come in the form of individuals, in disguise, offering little tidbits of advice that help lead things in the "proper" direction. This in turn may gain the ire of the other dragonflights, who would only see a world recovering, gaining peace, and bronze dragons seemingly trying to change that. Hell, the other dragonflights may even team up with the infinites to stop this perceived threat!
I like the idea of the Scourge being left unchecked in Northrend and Yogg-Saron corrupting them, but wouldn't 'Future Jaina' know about Yogg-Saron? Maybe this is where the Infinite Dragonflight can start opposing Jaina and the rest of the heroes...
The Bronze Dragonflight aiding the evil forces is genius. This whole time I was just thinking of them as "good" guys, instead of thinking of their true purpose: to maintain the current timelines. This could also build on my new Jaina's personality as a vindictive, manipulative sorceress, driven by her past life's grief and misery, who eventually succeeds in crushing the Bronze Dragonflight for "hiding" this possibility/timeline.
We could also argue that the current Nozdormu is already corrupted, mentally, and actually wanted the Opening of the Dark Portal, Thrall's escape, the Culling etc to happen, in an attempt to create a timeline in which he averts his own demise. The Infinite are actually Bronze Dragonflight from a parallel/ branched off timeline possibility, that got persuaded by Nozdormu to do some stuff that turned them. Nozdormu would then use this Dragonflight as pawns in his current timeline. Adventurers would be sent to kill Murozond in a different timeline, like a "simulated one", or a parallel timeline that only exists as a possibility, parallel to the main timeline, as a distraction. (I don't know, I just feel this guy was too chilled about his death in the End Time after Murozond's defeat, as if that wasn't what the Titans showed him or as if it was never real)
The Infinite Dragonflight keep talking about saving lives and preventing deaths throughout encounters in WoW, so what if we can argue that after Murozond's death, the Infinite Dragonflight that are left, find out they were deceived, and the way things happened, wasn't the way the timeline was supposed to go and was manipulated from the start by Nozdormu to elongate his life.
The Infinite's we faced in WoW, could actually have went back to all these events to prevent their deception in a branched off timeline, by their master. This could also be a reason for them to aid Jaina.
If you're going to have an evil Jaina, then this timeline's should still be around to stop her. Maybe the future one puts her in statis and is broken out by dragons/dreadlords/Medhiv/[insert major power here], and both around to see their father die.
And if we're going to have character alignments change around, could you have Anub'arak freed from the Scourge?
I suggest to make Garithos a proud warrior of the Alliance .To fight with Arthas side by side to save Lordaeron , maybe ?
Freed like Sylvanas? What would the purpose be in doing so? Where would he fit into the story?
What about to make Garithos to become The Lich King ? He would fit the role, he has the hunger for power and the right motives.
I agree Garithos wouldnt be strong enough to become The Lich King. What about Thrall to become The Lich King ? I never saw Thrall as a evil hero so it would be very unique.
I think the best candidate for LK would be Grom *or* Ilidan if you want to use Night Elfs as well but i am still of my idea that the best candidate for LK would be Grom.
Medhiv could warn them that the Legion is poised to take the Eastern Kingdoms, and that with orcs, elves and humans working for them, no amount of mass-Detonate will help. Thus the Night Elves go through all the various awakenings a lot faster since the invaders haven't made it into Ashenvale yet, and together with allied races like the furbolgs and tauren launch a rescue expedition to the East (would Thrall have landed at this point?), fighting off Undead from the north, naga from the east and satyrs who've felt their masters returning.
Ideas for what the Legion needs to be stopped from doing in the east: Use Illidan's spell to tear great big holes in Kalimdor, open portals all over the place including the Sunwell and the Maelstrom, summon other demon lords, take over the Emerald Dream, etc.
I like the idea of Medhiv not quite knowing what will happen (although if his cutsecenes are any indication, he doesn't know the future, just tries to swing events one way, i.e. getting humanity to flee west). Maybe he sees multiple futures, and the canon future is occasionally replaced by the new timeline? He needs a long talk with future Jaina, that's for sure.
So the humans and orcs will make an alliance once again ?
What about the night elves ? They had a huge role in defeating the legion.