i found these in theopening cinemetic and book of cain
Diablo's appearance in Diablo III is different from what he looks like earlier
now he has something looks like heads on each of his shoulders
and the head which on his left shoulder, is similar to one of Tathamet's head,i think it's the head which spawned Mephisto or Baal
just as u see in the image below
pay attention to the top left corner of the first image, and the left shoulder of Diablo in the second image
so what do u think
i suspect that Diablo has assimilated Baal and Mephisto's soul
and he wants to be Tathamet when he assimilate the soul of all six devil lord at last
then "heaven shall tremble"...
Well actually, that pic you posted from the book of cain isn't Diablo. That's tathamet, or 'the dragon' or whatever, and the dude standing there is Anu. BUT, the dragon (which was cast out of Anu because of it's evil) did have 7 heads, and it's presumed that Diablo is trying to absorb the 6 other demons to become him again (The prime evil).
i guess when "diathamet"rush into the High Heaven, he catch the Archangels, corrupt them
so that's why we fight with imperius, we fight in garden of hope, library of fate
at last we rescue the angels,and defeat "diathamet" with angels' help
Kulle, a former member of the Horadrim, created the Black Soulstone in order to "feel alive" once again, after being left hollow from his ordeals in chasing down the Three. He sought to capture the essence of angels and devils.
It's curious that Kulle also speculated on the nature of the Abyss, where angels and demons are sent upon "death". This was noted towards the section on the Hellforge.
I think the Black Soulstone somehow taps into the Abyss, which will dredge up the Three as a unified Prime Evil.
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Be it through hallowed grounds or lands of sorrow
All in the Forger's wake is left bereft and fallow
Is the residuum worth the cost of destruction and maiming;
Or is the shaping a culling and exercise in taming?
The road's goal is the dark Origin of Being
But be wary through what thickets it winds.
-Excerpt from the Litany of Residuum;
As Translated by He Who Brings Order