I've been thinking about the nature of Diablo's newest incarnation.
It's generally accepted the fan community that Diablo will absorb the Greater Evils and manifest into that body, becoming THE Prime Evil incarnate. We see characteristics of different creatures fused in this new body, and it's generally accepted that this comes from Baal, Mephisto, Andariel, Duriel and Diablo himself.
This was something I believed, too, until V-Day.
Sin Incarnate: The Lieutenants
Blizzard released imagery of Gluttony Incarnate, one of Asmodan's lieutenants. I looked him up and found something surprising. I then researched what we know about Asmodan's other lieutenants: Cyndaea, Ghom and Rakanoth.
Ghom -- Gluttony -- has these... mouths on his shoulders. So does New Diablo. So I thought to myself, What if Diablo has absorbed not the Greater Evils, but Asmodan's lieutenants? He has Ghom's shoulders; the feminine quality of Cyndaea; and the blades of Takanoth.
Asmodan's Plan: Betrayal
Thinking about this also made me wonder about Asmodan's goals. Presumably, he knows of "The Trap" that befell the demons of Hell. Many of us believe that the Black Soulstone is the key to this "trap", absorbing demonic souls sent to the Void, Angelic and Demonic. This would let Asmodan become The Prime Evil, once he gets his hands on the stone and all its souls.
So why invade Sanctuary? Does hesimply hope to find it? What if he has a another goal? Perhaps he is leading the Legions of Hell to their doom in order to fill the void with even more demonic souls? This would include his lieutenants' deaths!
This is what Baal did; he spread destruction across the world to empower his Soulstone of Destructiob and use it to corrupt the WorldStone.
Perhaps it is through these deaths that Diablo gains the new body? Perhaps -- and this would be a kicker! -- the amaglamated souls of all demonic kind cry out for revenge against Asmodan, and fuse together in defiance? That would be an interesting twist; Asmodan's own lieutenants avenge their own deaths after he betrays them!
Of course, it's been said that some of Asmodan's lieutenants live on in order to perpetuate the Diablo franchise in expansions. My hypothesis also leaves out the Arch Angels. All I can say to that is, Perhaps their contribution to the New Diablo takes on the form of those long, curving blades on his back, a physical manifestation of their angelic wings?
Who knows. Just a few thoughts.
tl;dr Asmodan betrays his lieutenants; their bodies/souls are fused together to form the New Diablo.
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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