I've been reading a lot about the end of days prophesy, the interpretation I'm most inclined to believe is that Mephisto and Diablo's defeat is what the prophecy refers to when it says the defeat of the prime evils will be an illusion. Following that line of thinking the prime evils' true plan would have something to do with the worldstone.
Now if you notice Baal DIDN'T destroy the worldstone, even though he easily could have done so, given that he had pretty big lead on the heroes.
Looking over the rest of the diablo storyline:
Mysteriously, the legions of hell revolt against the three prime evils, banishing them to Sanctuary... somehow.
Tyrael creates the horadrim and tasks them with capturing the three prime evils in soulstones that he provides. It is later revealed that it is these soulstones that are allowing the prime evils to remain in the mortal world, and that, contrary to what mortals had been lead to believe, there was a way of destroying the soulstones, thus assuring the defeat of the primes in the realm of sanctuary.
Since the soulstones WHERE NOT destroyed however, the primes survive, allowing them to corrupt Sanctuary to the brink of destruction.
Once again Tyrael steps into the picture, UNFORTUNATELY Tyrael is UNABLE TO PREVENT MARIUS (a weak little old man) FROM RELEASING BAAL.
Upon this failure Tyrael tasks Marius (a weak, unstable little old man) with taking Baal's soulstone to the hell forge.
Now pause for a second:
would YOU have trusted Marius to 1) have the courage to step into hell. 2) Fight his way through the river of flame and to the hellforge. 3) KILL the smithy. 4) Have the strength of will to finally destroy the soulstone,
given his unstable and cowardly nature?
After pretty much assuring that Baal's soulstone is safe from destruction, Tyrael directs a group of mortal heroes to Kurast, where these heroes defeat and kill mephisto (UNFORTNATELY they where unable to get there sooner, thus preventing the wanderer's transformation).
Heroes go into hell, Diablo dies, blah, blah.
WHILE THE HEROES ARE BUSY TRACKING DOWN AND KILLING DIABLO... Baal manages to find his soulstone, further securing his survival, amasses a legion of his minions, and moves towards Mount Arriatt.
ONCE AGAIN DIRECTED BY TYRAEL (and Cain through HORADRIM lore, wich is to say Tyrael's teachings), the heroes ensue on a hectic race to get to the worldstone before Baal gets there, UNFORTUNATELY they where to late, Baal had alread corrupted the world stone and TYRAEL is FORCED, AGAINST HIS WILL, to destroy it.
So here's my take on this. This is all Tyrael's doing. He NEEDS to destroy the world stone, for reasons as of yet untold, but knows that he can't simply go up and destroy it, since he's tasked with the protection of Sanctuary. So he somehow gets the prime evils into Sanctuary and makes the horadrim capture them in soulstones. This ensures that their corruption leaks into the world, slowly weakening the world without the risk of the prime evils taking over Sanctuary (or using it as a base of operations for attacks on heaven, could be one or the other.. maybe both). But Tyrael KNOWS, having crafted the soulstones himself, that eventually the three will break free. When this happens he acts as a puppeteer, guiding the actions of the "good guys" in such a way as to allow the prime evils just enough leeway for HIS interests to be met. Once Diablo and Mephisto are of no use to him he tells the human heroes how to destroy them, masterfully neutralizing their threat, while at the same time sending the heroes on wild chase that will allow Baal to gain a healthy head start to Mount Arriat. Once Baal corrupts the world stone, Tyrael has an excuse to destroy it, thus fulfilling his goal. Keep in mind also that the soulstones where produced by Tyrael for the express purpose of containing the prime evils. It COULD be assumed that somehow, upon their destruction he can gain some or all of the powers of the prime evils.
So in a nutshell: Tyrael manipulates the prime evils and the mortal men of sanctuary in a masterful display of divine puppeteering in such a way as to allow him to destroy the worldstone without being questioned or condemned.
Besides, who else is wondering why there's concept art of Tyrael going from bathed in a holy white light, to engulfed in hellish fire?
Very interesting.
I think the angels will play a deeper role than Tyrael played in the previous game, maybe we will get to fight them to free the world from heaven and hell influence. That's why the paladin is out, he fight for good but maybe the game has the perspective of the followers of Rathma. Fighting for our, world our existence, not for somebody rules and ambitions.
Okay, hmm. I dunno what to think about this, kinda hanging on two thoughts here.
To support your theory
Izual: "Tyrael was a FOOL to have trusted me! You see, it was I who told the Prime Evils about the soulstones and how to corrupt them. It was I who helped them mastermind their own exile into you world." --- Uhm, nope. Not a fool at all. Tyrael knew just what you were up to, and used you to further his own goals.
To undermine your theory
Heaven strictly refrains from intervening in the mortal world. If Tyrael wanted the Worldstone destroyed without being questioned for it, one could very much wonder wether this is best way to go about it. In fact, he might be more severely punished now than he would be if he'd simply destroyed the Worldstone and that was that.
Hmm I just came up with this after maybe 3 years of not playing diablo 2. In fact I just learned that there's a series of books on diablo which I would very much like to read. I also just learned about Imperius.
I like my theory and I think it has merit though. The key question here is what is Tyrael up to and what is he after?
You mention that Tyrael might be punished more severly now than if he'd just gone up and destroyed the world stone. I think differently, because by destroying it he WAS, technically, defending Sanctuary from the corruption Baal had begun. In any case maybe Tyrael's own agenda extends beyond that of the other angels. Maybe he sees Sanctuary as a viable power base for himself... maybe there's some hidden power in Sanctuary and the Worldstone's destruction will a) awaken that power, send the hosts of heaven and hell running to claim it/destroy it before it becomes a menace (i.e. falls into the wrong hands or realizes its full potential and surpasses both heaven and hell... going on traditional power struggle stories, this sort of thing depends on the kind of 'hidden power' really).
This would be interesting.. imagine playing the whole of Diablo 3 as Tyrael's Ally against Heaven and Hell only to discover he was actually building a power base for himself and then fighting him.
I think I have a lot of reading to do, but I'm stickying to my theory for now, it has a lot of potentail for development :D.
i think baal didnt destroy the world stone because he was corrupting it so that only hell could easly come to sanctuary, but still restricted heaven. Tyrael knew this so he destroyed the world stone so that atleast heaven could just as easly come to sanctuary to give humans a chance. Becuase if hell was able to come to sanctuary without resistance as i think Baal was intending to do, and heaven was resisted then sanctuary would easly be over come by hell. With the world stone completly destroy atleast it gives sanctuary a chance.
This is all just a theory i dont really have proof to back it up, but thats why i think tyrael destroyed the world stone.
Tyrael has done to much for mankind i don't think he turns evil. In demons bane he helps siggard find Diablos favorite luit. The guy thats imortal to all living weapons. Without Tyrael , hell would have surley taken over a huge chunk of sanctuary.
Baal tricked Tyrael by corrupting the Worldstone. Baal placed all his power from his Soulstone into the Worldstone. When Tyrael was forced to destroy it, it released Baal's life energies and corrupted Tyrael. I mean, Baal tricked Marius by appearing to be Tyrael - therefore he should be able to trick others.
Taken in by the High Heavens to question his actions, Tyrael's corrupted soul ravages the unprepared Angiris Council. After twenty years of laying waste to the High Heavens, they gather enough power to banish Tyrael's evil soul (Baal) and send him crashing to Sanctuary in a ball of fire, penetrating the labyrinth beneath Tristram - awakening old evils.
The Destruction of the Worldstone was planned by Hell. They wanted it destroyed.
Jay Wilson even says so in one of the interviews; so that ruins the 'Tyrael is good because he destroyed Worldstone to let heaven in the Sanctuary' theory.
Of course Jay could be putting us off, but i don't think so. I really think you're close, but i think the game has less to do with Baal and more to do with Diablo. I've seen many D3 logos with Diablos face in it, and of course, the game IS called DIABLO 3. He has to be in it somewhere, no?
We're all very close. I also want to know what Leah's importance is in it all.
Jay Wilson even says so in one of the interviews; so that ruins the 'Tyrael is good because he destroyed Worldstone to let heaven in the Sanctuary' theory.
That theory wouldn't make sense to begin with since the Angiris Council is against intervention in Sanctuary. My bet is Tyrael did what he thought was the best action at the time- you'll remember he wasn't acting on orders of the Council when he helped you against the Three- because he obviously couldn't undo Baal's evil on the Worldstone, and if he let the Worldstone be, well, Sanctuary would be lost to evil no question. But if its destroyed, then Baal's corruption ends. From the game, anyone you talked to, including Tyrael, had any idea what was going to happen when the Worldstone was destroyed. The most common theory on this forum is that the barriers would just vanish. But in all honesty, no one (none of the NPC's) had any idea what would happen next.
Anyway, back to my forming thought: Tyrael did what he thought was best. He weighed his options:
1. Let Baal's corruption of the Worldstone continue and pervert all of Sanctuary, while also letting in untold masses of Demons from Hell.
2. Destroy it, ruin Baal, end the corruption, and (assuming Tyrael did know the action would make the barriers vanish, or maybe assuming he was just gambling it would happen) have humanity (and the High Heavens) fight Hell on Sanctuary as both Heaven and Hell pour in to Sanctuary as a battle field.
There are some implications of that last number, as well. It was said in the cinematics that the Three wanted to make Sanctuary a permanent out post of Hell. So that would mean while Sanctuary is an out post, the doorstep of Heaven is the battle field, which has been the goal of the Burning Hells since eternity past.
However, something that could develop out of that is that Hell might no have included humanity in its equation (for instance, they were thinking Hell vs. Heaven, while its really more like Hell vs. Most of Humanity as well as Heaven and Heaven vs. Some of Humanity as well as Hell). Since humanity has typically aligned itself with Heaven (especially because of the Zakarum faith), Hell would have an additional adversary that it might not have anticipated as being a problem initially. And, of course, it would be Hell's fault heroes arose, anyway, because heroes only arose to defeat Hell (or, more specifically, any ill intention against Sanctuary).
What this would mean for Tyrael, however, is that he would have to face the judgment of the Council, for disobeying orders of isolationism from Sanctuary, for unintentionally aiding the plans of Hell, and for bringing the battlefield to Heaven's doorstep, which I'm assuming would equal banishment.
And, on the note about when a soulstone is destroyed, the soul escapes and possesses someone, might I remind you that your hero in Diablo II smashes Mephisto's soulstone with no issues.
While the events do appear to be very close and surprisingly close when put out in this manner, close things happen, and with only a limited number of characters in the original game and the need for things to be close, Tyrael had to play this role. As for letting Marius run away alone, I have no idea why that happens, it's just upright strange.
First of all, the Prime Evils are masterful. I have a hard time believing Tyrael can lead all of them on a leash over several hundred years without them spoiling his plot even once. Second, Izual mentions to the hero just before he dies that the Prime Evils mastermidned the plot with the Soulstones, and that it was their intention to be trapped.
But most of all, the greatest problem I have with the theory is it's dependence on mortal heroes. How can Tyrael let mortal warriors, whom have never before succeded to kill the Three before, to not only elimnate one, but all three, at at precisely the right moment as well? That just goes beyond all logic and reasoning.
As for Acidreigns theory, I find it hard to believe that four Archangels would not know their greatest adversary upon sight, even if he is in anothe shape. Tricking a mentally deranged man in a madhouse is one thing; tricking an Archangel, one of the most powerful beings in existence, is another.
If I remember correctly, Inarius immediately saw Diablo for what he was upon meeting him in the Velied Prophet. I don't think any of the other four angels are any less capable in that respect.
Quote from "Magistrate" »
And, on the note about when a soulstone is destroyed, the soul escapes and possesses someone, might I remind you that your hero in Diablo II smashes Mephisto's soulstone with no issues.
PlugY for Diablo II allows you to reset skills and stats, transfer items between characters in singleplayer, obtain all ladder runewords and do all Uberquests while offline. It is the only way to do all of the above. Please use it.
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It seems that the strongest points in this thread are the ones concerning Sanctuary as a battlefield and Tyrael's going against the orders of the High Heavens.
I like the idea of Tyrael being the meteor, but not in a corrupted sense. Maybe he is only cast down from the High Heavens once and for all.
Now the battlefield of Sanctuary, with some humans on the side of Heaven and other on the side of Hell is very interesting. It even leaves room for a human vs. Heaven conflict.
I'll pose another question here. If Heaven and Hell are both invaders in Sanctuary, would that inspire a faction (possibly aligned with a banished Tyrael) to fight against both in the name of Sanctuary as a world in and of itself independent of either the Heavens or Hells?
I'll pose another question here. If Heaven and Hell are both invaders in Sanctuary, would that inspire a faction (possibly aligned with a banished Tyrael) to fight against both in the name of Sanctuary as a world in and of itself independent of either the Heavens or Hells?
It's certainly a possibility. It's always been alluded that Sanctuary would be no better of if Heaven ruled over it than if Hell did, as they are both extremes, with Sanctuary being the mix of both of them.
So far in the story, the mortal heroes have all fought with Heaven against Hell because the latter has been seeking to outright enslave and destroy the whole world, while Heaven has taken a more passive role. If that ever changed, then humanity could well be standing in between two enemies.
PlugY for Diablo II allows you to reset skills and stats, transfer items between characters in singleplayer, obtain all ladder runewords and do all Uberquests while offline. It is the only way to do all of the above. Please use it.
Supporting big shoulderpads and flashy armor since 2004.
[quote name='Magistrate']That theory wouldn't make sense to begin with since the Angiris Council is against intervention in Sanctuary.
The reason imperius wants to destroy sanctuary is because hell wants to use sanctuary/humans as weapons against heaven and imperius feels that sanctuary will be the end of heaven. And u contradicted ur self saying that sanctuary will be a battle feild for heaven and hell because u just said The heavens are against intervention in sanctuary so why would they have a battle there? But my theory still stands....if the world stone wasnt destroyed only hell would have access to sanctuary and ultimatly corrupt it. So tyrael destroyed it so that heaven can atleast prevent hell from aquiring what might be the ultimate weapon(all of humanity and the powers hidden within them). I think humans are a very powerful weapon because if u look at Bartuc(the warlord of blood) he was a human and lead many armies of demons. Also if u look at horazon (Bartucs brother) he was also a very powerful human who faught against and killed many demons. So i can see why both heaven and hell would fight for the control of sanctuary because if they can enpower humans such as these 2 and control them and allow them to fight for them then they can be very dangerous weapons especialy in mass numbers.
Sry for spelling not totally sure how everyones names are spell but let me know what u think.
O yea on another note many other beings in heaven did not want to interven in the matters of sanctuary but tyrael intervened all the time because it was what he thought was right. And yes he might be banished from heaven for doing what he did but in the end instead of the Battle being on Heavens doorstep(which i dont think heaven wants) the battle will be on sanctuary.
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Now if you notice Baal DIDN'T destroy the worldstone, even though he easily could have done so, given that he had pretty big lead on the heroes.
Looking over the rest of the diablo storyline:
Mysteriously, the legions of hell revolt against the three prime evils, banishing them to Sanctuary... somehow.
Tyrael creates the horadrim and tasks them with capturing the three prime evils in soulstones that he provides. It is later revealed that it is these soulstones that are allowing the prime evils to remain in the mortal world, and that, contrary to what mortals had been lead to believe, there was a way of destroying the soulstones, thus assuring the defeat of the primes in the realm of sanctuary.
Since the soulstones WHERE NOT destroyed however, the primes survive, allowing them to corrupt Sanctuary to the brink of destruction.
Once again Tyrael steps into the picture, UNFORTUNATELY Tyrael is UNABLE TO PREVENT MARIUS (a weak little old man) FROM RELEASING BAAL.
Upon this failure Tyrael tasks Marius (a weak, unstable little old man) with taking Baal's soulstone to the hell forge.
Now pause for a second:
would YOU have trusted Marius to 1) have the courage to step into hell. 2) Fight his way through the river of flame and to the hellforge. 3) KILL the smithy. 4) Have the strength of will to finally destroy the soulstone,
given his unstable and cowardly nature?
After pretty much assuring that Baal's soulstone is safe from destruction, Tyrael directs a group of mortal heroes to Kurast, where these heroes defeat and kill mephisto (UNFORTNATELY they where unable to get there sooner, thus preventing the wanderer's transformation).
Heroes go into hell, Diablo dies, blah, blah.
WHILE THE HEROES ARE BUSY TRACKING DOWN AND KILLING DIABLO... Baal manages to find his soulstone, further securing his survival, amasses a legion of his minions, and moves towards Mount Arriatt.
ONCE AGAIN DIRECTED BY TYRAEL (and Cain through HORADRIM lore, wich is to say Tyrael's teachings), the heroes ensue on a hectic race to get to the worldstone before Baal gets there, UNFORTUNATELY they where to late, Baal had alread corrupted the world stone and TYRAEL is FORCED, AGAINST HIS WILL, to destroy it.
So here's my take on this. This is all Tyrael's doing. He NEEDS to destroy the world stone, for reasons as of yet untold, but knows that he can't simply go up and destroy it, since he's tasked with the protection of Sanctuary. So he somehow gets the prime evils into Sanctuary and makes the horadrim capture them in soulstones. This ensures that their corruption leaks into the world, slowly weakening the world without the risk of the prime evils taking over Sanctuary (or using it as a base of operations for attacks on heaven, could be one or the other.. maybe both). But Tyrael KNOWS, having crafted the soulstones himself, that eventually the three will break free. When this happens he acts as a puppeteer, guiding the actions of the "good guys" in such a way as to allow the prime evils just enough leeway for HIS interests to be met. Once Diablo and Mephisto are of no use to him he tells the human heroes how to destroy them, masterfully neutralizing their threat, while at the same time sending the heroes on wild chase that will allow Baal to gain a healthy head start to Mount Arriat. Once Baal corrupts the world stone, Tyrael has an excuse to destroy it, thus fulfilling his goal. Keep in mind also that the soulstones where produced by Tyrael for the express purpose of containing the prime evils. It COULD be assumed that somehow, upon their destruction he can gain some or all of the powers of the prime evils.
So in a nutshell: Tyrael manipulates the prime evils and the mortal men of sanctuary in a masterful display of divine puppeteering in such a way as to allow him to destroy the worldstone without being questioned or condemned.
Besides, who else is wondering why there's concept art of Tyrael going from bathed in a holy white light, to engulfed in hellish fire?
I think the angels will play a deeper role than Tyrael played in the previous game, maybe we will get to fight them to free the world from heaven and hell influence. That's why the paladin is out, he fight for good but maybe the game has the perspective of the followers of Rathma. Fighting for our, world our existence, not for somebody rules and ambitions.
Hmm I just came up with this after maybe 3 years of not playing diablo 2. In fact I just learned that there's a series of books on diablo which I would very much like to read. I also just learned about Imperius.
I like my theory and I think it has merit though. The key question here is what is Tyrael up to and what is he after?
You mention that Tyrael might be punished more severly now than if he'd just gone up and destroyed the world stone. I think differently, because by destroying it he WAS, technically, defending Sanctuary from the corruption Baal had begun. In any case maybe Tyrael's own agenda extends beyond that of the other angels. Maybe he sees Sanctuary as a viable power base for himself... maybe there's some hidden power in Sanctuary and the Worldstone's destruction will a) awaken that power, send the hosts of heaven and hell running to claim it/destroy it before it becomes a menace (i.e. falls into the wrong hands or realizes its full potential and surpasses both heaven and hell... going on traditional power struggle stories, this sort of thing depends on the kind of 'hidden power' really).
This would be interesting.. imagine playing the whole of Diablo 3 as Tyrael's Ally against Heaven and Hell only to discover he was actually building a power base for himself and then fighting him.
I think I have a lot of reading to do, but I'm stickying to my theory for now, it has a lot of potentail for development :D.
This is all just a theory i dont really have proof to back it up, but thats why i think tyrael destroyed the world stone.
Well thats a twist you would never see coming :D.
Taken in by the High Heavens to question his actions, Tyrael's corrupted soul ravages the unprepared Angiris Council. After twenty years of laying waste to the High Heavens, they gather enough power to banish Tyrael's evil soul (Baal) and send him crashing to Sanctuary in a ball of fire, penetrating the labyrinth beneath Tristram - awakening old evils.
The Destruction of the Worldstone was planned by Hell. They wanted it destroyed.
Jay Wilson even says so in one of the interviews; so that ruins the 'Tyrael is good because he destroyed Worldstone to let heaven in the Sanctuary' theory.
Of course Jay could be putting us off, but i don't think so. I really think you're close, but i think the game has less to do with Baal and more to do with Diablo. I've seen many D3 logos with Diablos face in it, and of course, the game IS called DIABLO 3. He has to be in it somewhere, no?
We're all very close. I also want to know what Leah's importance is in it all.
That theory wouldn't make sense to begin with since the Angiris Council is against intervention in Sanctuary. My bet is Tyrael did what he thought was the best action at the time- you'll remember he wasn't acting on orders of the Council when he helped you against the Three- because he obviously couldn't undo Baal's evil on the Worldstone, and if he let the Worldstone be, well, Sanctuary would be lost to evil no question. But if its destroyed, then Baal's corruption ends. From the game, anyone you talked to, including Tyrael, had any idea what was going to happen when the Worldstone was destroyed. The most common theory on this forum is that the barriers would just vanish. But in all honesty, no one (none of the NPC's) had any idea what would happen next.
Anyway, back to my forming thought: Tyrael did what he thought was best. He weighed his options:
1. Let Baal's corruption of the Worldstone continue and pervert all of Sanctuary, while also letting in untold masses of Demons from Hell.
2. Destroy it, ruin Baal, end the corruption, and (assuming Tyrael did know the action would make the barriers vanish, or maybe assuming he was just gambling it would happen) have humanity (and the High Heavens) fight Hell on Sanctuary as both Heaven and Hell pour in to Sanctuary as a battle field.
There are some implications of that last number, as well. It was said in the cinematics that the Three wanted to make Sanctuary a permanent out post of Hell. So that would mean while Sanctuary is an out post, the doorstep of Heaven is the battle field, which has been the goal of the Burning Hells since eternity past.
However, something that could develop out of that is that Hell might no have included humanity in its equation (for instance, they were thinking Hell vs. Heaven, while its really more like Hell vs. Most of Humanity as well as Heaven and Heaven vs. Some of Humanity as well as Hell). Since humanity has typically aligned itself with Heaven (especially because of the Zakarum faith), Hell would have an additional adversary that it might not have anticipated as being a problem initially. And, of course, it would be Hell's fault heroes arose, anyway, because heroes only arose to defeat Hell (or, more specifically, any ill intention against Sanctuary).
What this would mean for Tyrael, however, is that he would have to face the judgment of the Council, for disobeying orders of isolationism from Sanctuary, for unintentionally aiding the plans of Hell, and for bringing the battlefield to Heaven's doorstep, which I'm assuming would equal banishment.
And, on the note about when a soulstone is destroyed, the soul escapes and possesses someone, might I remind you that your hero in Diablo II smashes Mephisto's soulstone with no issues.
First of all, the Prime Evils are masterful. I have a hard time believing Tyrael can lead all of them on a leash over several hundred years without them spoiling his plot even once. Second, Izual mentions to the hero just before he dies that the Prime Evils mastermidned the plot with the Soulstones, and that it was their intention to be trapped.
But most of all, the greatest problem I have with the theory is it's dependence on mortal heroes. How can Tyrael let mortal warriors, whom have never before succeded to kill the Three before, to not only elimnate one, but all three, at at precisely the right moment as well? That just goes beyond all logic and reasoning.
As for Acidreigns theory, I find it hard to believe that four Archangels would not know their greatest adversary upon sight, even if he is in anothe shape. Tricking a mentally deranged man in a madhouse is one thing; tricking an Archangel, one of the most powerful beings in existence, is another.
If I remember correctly, Inarius immediately saw Diablo for what he was upon meeting him in the Velied Prophet. I don't think any of the other four angels are any less capable in that respect.
And Diablo's.
I like the idea of Tyrael being the meteor, but not in a corrupted sense. Maybe he is only cast down from the High Heavens once and for all.
Now the battlefield of Sanctuary, with some humans on the side of Heaven and other on the side of Hell is very interesting. It even leaves room for a human vs. Heaven conflict.
I'll pose another question here. If Heaven and Hell are both invaders in Sanctuary, would that inspire a faction (possibly aligned with a banished Tyrael) to fight against both in the name of Sanctuary as a world in and of itself independent of either the Heavens or Hells?
So far in the story, the mortal heroes have all fought with Heaven against Hell because the latter has been seeking to outright enslave and destroy the whole world, while Heaven has taken a more passive role. If that ever changed, then humanity could well be standing in between two enemies.
The reason imperius wants to destroy sanctuary is because hell wants to use sanctuary/humans as weapons against heaven and imperius feels that sanctuary will be the end of heaven. And u contradicted ur self saying that sanctuary will be a battle feild for heaven and hell because u just said The heavens are against intervention in sanctuary so why would they have a battle there? But my theory still stands....if the world stone wasnt destroyed only hell would have access to sanctuary and ultimatly corrupt it. So tyrael destroyed it so that heaven can atleast prevent hell from aquiring what might be the ultimate weapon(all of humanity and the powers hidden within them). I think humans are a very powerful weapon because if u look at Bartuc(the warlord of blood) he was a human and lead many armies of demons. Also if u look at horazon (Bartucs brother) he was also a very powerful human who faught against and killed many demons. So i can see why both heaven and hell would fight for the control of sanctuary because if they can enpower humans such as these 2 and control them and allow them to fight for them then they can be very dangerous weapons especialy in mass numbers.
Sry for spelling not totally sure how everyones names are spell but let me know what u think.
O yea on another note many other beings in heaven did not want to interven in the matters of sanctuary but tyrael intervened all the time because it was what he thought was right. And yes he might be banished from heaven for doing what he did but in the end instead of the Battle being on Heavens doorstep(which i dont think heaven wants) the battle will be on sanctuary.