For that matter, Kil'jaeden may never have been physically present on Draenor at all. He first appeared to Ner'zhul in dreams, and later appeared to all of the orcs, but always by flashing in and out of existence, more like a projection than an actual creature. It could have been an avatar, or it could have simply been a trick of the mind -- but it was never really confirmed whether or not Kil'jaeden was on the world in his physical form.
Q4tQ: how long is a year on Azeroth? I mean seriously A LOT has apparently happened in 10 years.
A year is ... well, a year, in Warcraft time. If you want it correlated to real time, there isn't really a correlation. Most World of Warcraft expansions have lasted a year in game time -- so the entirety of Burning Crusade was a year's worth of Azeroth time, the entirety of Wrath was a year's worth of Azeroth time. So far the only expansion to break that rule of thumb is Cataclysm, which lasted two years worth of Azeroth time -- Cataclysm happened in year 28, Mists in year 30.
Q4TQ:On our timeline Grom killed Manaroth and that ended the demonic curse over the orcs. On Alternate Draenor, Grom killed Manaroth, but Gul'dan and his followers are all kicking demonic powers, where those powers came from ?
Drinking Mannoroth's blood didn't turn the skin of the orcs green -- continued exposure to fel magic and corruption did. It didn't give them warlock powers, that came from Kil'jaeden before they drank the pit lord's blood. The blood didn't cause the green skin or sudden aptitude for fel magic -- that's not what it's for. What the blood does is speed that corruption process up in fast-forward, and kickstart an overdrive into bloodlust, binding the souls of those who drink to the Burning Legion. It's a blood pact kind of thing. A demonic steroid-infused blood pact.
In Warlords, we've seen that Gul'dan has green skin -- in the comic, we saw why he has it, because he went ahead and drank the blood first. But he and his followers, however many in number they may be, are already messing around with fel magic and Legion power. They just don't have the rest of the Horde on their side at the time that Warlords begins -- Garrosh saw to that.
Before the Pitlords were inducted into the BL, were their hairflames a different color? Or do you think they were always a handsome shade of Fel green?
Before they were pit lords of the Burning Legion, they were noble centaur with long, flowing tresses, unicorn horns and gleaming hooves. Fel blood, man. It does a number on you.
Q4TQ: Does Azeroth have actual seasons? Obviously in-game each zone is kept in stasis, but in the canon does Elwynn Forest (e.g.) have snowstorms around Winter Veil?
There are references to the seasons passing in many of the novels, but in-game we don't see it going on. In Arthas, there's plenty of references to Lordaeron in all seasons. One would assume it varies by region -- Tanaris isn't likely to get a lot of snow, for example -- but seasons still happen.
Q4tQ: are there any dragons in WoW that are or have been corrupted or otherwise influenced by the burning legion/demons, the closest I can think would be the bit Kalecgos went through in the sunwell, but I'm not entirely sure if that should count or not
There are two to my knowledge -- one of them is also in Sunwell Plateau. Felmyst was originally a bllue dragon, slain and brought back by the blood of the pit lord Brutallus. The other is Nightbane, also originally a blue dragon (blue dragons have the worst luck, don't they?). Upon confronting Medivh, Arcanagos found himself the victim of a spell that had him burning from within. Given that Medivh was very much under control of Sargeras at that point, it's likely it was fel magic -- something mentioned by Senior Historian Sean Copeland on Twitter.
q4tq: Why is the legion set on destroying azeroth? Is azeroth just one of many worlds trying to be concurred, or is it that we have stopped them multiple times and now they want to prove that they can ?
If we had the answer to that question, we might know all the secrets there are to know about Warcraft. But I think the best guess that can be made is simple revenge. Sargeras was all lined up to step through the portal the kaldorei had created and take control of the world and the Well of Eternity during the War of the Ancients, but he was stopped by Azeroth's mortals. Not only that, but one of them, Broxigar, is the only mortal creature known to have ever struck a physical blow to Sargeras himself. That wound was enough to distract Sargeras and allow Malfurion and Illidan to snap the portal closed right on top of Sargeras, destroying his physical form and sending him hurtling back to the Twisting Nether.
Azeroth is likely the only world to have accomplished that kind of feat. We're strong, annoyingly so -- and perhaps terrifyingly so. If only one of our mortals can inflict damage on Sargeras, what could we all do if we concentrated our efforts and struck together? That kind of threat cannot be allowed to live, and so the Legion tries again and again to corrupt or destroy us, through as many different routes possible. It hasn't worked yet. And if Sargeras wasn't worried before, he should be by now.
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