Diablo III's plot takes place twenty years when the events in Diablo II, wherever a couple of heroes saved Sanctuary from fiendish invasion because of their defeat of Baal, one among the 3 Prime Evils and also the Lord of Destruction, and also the destruction of the Worldstone (and with it Baal's armies).
Those events passed mostly out of sight of the inhabitants of Sanctuary, and have since become stories of story. solely Deckard adult male and a couple of alternative humans witnessed those events, and that they square measure wide discredited and marginalised. Most of the inhabitants of Sanctuary thus have a false sense of security, unaware of the danger exhibit by a possible fiendish invasion and the way really unsafe their terribly existence is.
Little is understood of the core plot of Diablo III at now, tho' it's expected that the antagonists of the title are going to be Diablo, furthermore as 2 alternative major demons. One is understood to be the Lesser Evil, Belial (the Lord of Lies), that makes Azmodan (the Lord of Sin) the opposite logical selection. along they're the sole Lesser or Prime Evils to not nevertheless feature in a very Diablo title. They additionally conspired with each other to with success rebel against the Prime Evils (Mephisto, Diablo, and Baal) to seize management over hell, as explained within the original Diablo manual:[0]
"In their content, the Lesser Evils began to believe that the 3 were afraid to continue the war with Heaven. annoyed by the surcease of the war, Azmodan and Belial saw matters as their probability to overthrow the Prime Evils and take charge of Hell for themselves. the 2 demon lords created a treaty with their minor brethren, reassuring them that the wretched plague of humanity wouldn't deter the final word ending of the sons of Hell.
Azmodan and Belial devised an inspiration to finish the stalemate, come through ending within the Sin War and ultimately ride the bloody crest of the good Conflict straight into the terribly arms of Armageddon. Thus, a good revolution was set into motion as all of Hell visited war against the 3 Brothers...
The Brothers fought with all of the savagery of the Underworld, and to their credit, destroyed a 3rd of Hell’s treacherous legions. In the end, however, they were overcome by the bicornuous Death semiconductor diode by the traitors Azmodan and Belial. The Prime Evils, weakened and bodiless, were banished to the mortal realm wherever Azmodan hoped that they'd stay unfree forever.
Azmodan believed that with the 3 set loose upon humanity, the Angels would be forced to show their focus upon on the mortal plane - therefore going away the Gates of Heaven abandoned and defenseless. Those few demons United Nations agency still pledged allegiance to the 3 Brothers fled the wrath of Azmodan and Belial, escaping to the realm of Man to hunt out their lost Masters.
As the warfires died out upon the battlefields of Hell, Azmodan and Belial began to argue over that of them control the upper authority. The treaty that they'd created quickly fell to ashes because the 2 demon lords took up arms against one another. The legions of Hell that remained were polarized behind either military leader, launching themselves into a bloody war that has lasted to the present day..."