Yeah, so I think it's about time we have that talk we've all been putting off. We've beaten around the bush, but let's just get it over with and face the elephant in the room.
So, I'll begin. *ahem*
What. The. Fuck.
StarCraft I
The StarCraft I spoke of essence and form several times, summarized as follows:
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Originally Posted by StarCraft Manual
... Traveling thousands of light years into the burning core of the galaxy, the Xel'Naga eventually settled upon the volatile ash-world of Zerus. The Xel'Naga planned to continue their Grand Experiment of evolution, only this time they dismissed their tenets of physical and focused chiefly on the pursuit of a distinct purity of essence...
Ostensibly, the Xel'Naga pursued this route because;
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... The inherent essence and sentience of the Protoss developed far too rapidly, leading to bitter strife and division between them and their creators. The Xel'Naga deemed that the purity of form they sought to create had been sullied by a conflict of essence and thus decreed that the Protoss were, in fact, a failed creation. The Xel'Naga abandoned their children and launched themselves into the void.
Now, over Zerus, the Xel'Naga stepped back to behold their work;
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The Zerg, despite having an extreme physical handicap, had succeeded in not only surviving, but in retaining the purity of their terrible overriding essence. The Xel'Naga knew that they had achieved their goal.
Meanwhile, the Protoss bemoaned their lot in life.
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[The Protoss] believed that the Xel’Naga had been right to abandon them and that because their racial essence had been corrupted by the rise of ego, they were indeed a failed creation.... The greatest hope of Khas was that the Khala would instill a new sense of essence and vitality within the Protoss race. Slowly, many Protoss gave up their ages-old feuds and rallied behind the ever-growing legions of the Khalai
From these passages we've assumed a simple definition for essence and form: Form, quite literal as it seemed, referred to a being's physical aptitude.
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[The Protoss] were incredibly adaptable to harsh natural conditions and climates. Their strength and speed were unparalleled [...] However, their most distinct aspect was that they communicated with each other through a very complex method of instinctive telepathy, allowing them to operate communally with striking efficiency.
And thus the Protoss conformed, at first, to the Xel'Naga's model of a creature "that would be defined by a distinct Purity of Form." Strong, adaptable, powerful. Able to enact physical change in the universe with skill and efficiency.
The Zerg's Purity of Essence, on the other hand, was implied to have stemmed from the Overmind itself, which served as manifestation of all their hopes, instincts and intelligence. Essence is who and what you are, and what you plan to do with your strengths.
Enter Abathur
Now here comes Abathur, that hoarder of teleonomy.
Essence
From the conversations between him and Kerrigan, we are presented with a surprisingly philosophical perspective. To Abathur, the Evolution Engine himself, perfection is unattainable, but it is the pursuit that matters. In philosophy this is called entelechy; continual becoming, but never attaining.
In the vain hope of perfecting, Abathur and the Primal Zerg absorb essence. Simply, it is the genetic structure underlying an ability. Expanded from there, it is implied that all the experiences and accomplishments of a creature's successful ancestors are given form in DNA, which may be harvested and used by Zerg. DNA itself is almost deified among the Zerg.
Essence in definition has now been altered; rather than your intelligence and force of will -- who and what you decide to be -- it is now all that which you are. It is all potentialities, all paths given form. It is the change in the universe crystallized in a few million base pairs wound together in a double helix.
Form
Now, that leaves Form. What is form? It is clear our prior understanding has been invalidated by HotS; the Protoss have become more human with each game. They require technology and psionics to protect themselves from the elements, otherwise they are helpless. Turn down the thermostat enough and whamo, Protoss Pops in the freezer. The Zerg, however, go, "COME AT ME BRO!!!" and beat nature at its own game.
So far we've learned the Zerg are incredibly adaptable and versatile. The only thing they cannot assimilate is that which is wholly antithetical to them, namely the Protoss. The Protoss are contrasted by being stolid, stodgy, ill-equipped for change. They are the stagnation to the Zerg's potential.
Form in definition has now been left curiously nebulous and fallowed. Where it once stood for adaptability and strength, it has now been stripped of all that. Form, the noun, has been assimilated by Essence. So is Form, the verb, all that remains? The ability to form psionic abilities? If so, Kerrigan's beaten the Protoss at their own game.
So where are the Protoss left standing in this? What advantage. Do. They. Have? There's nothing special about them physically, and Kerrigan has proven humanity has greater psionic potential. In all respects the Protoss seem frozen in time.
So, I shall conclude thusly. Essence vs Form: What. The. Fuck.