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I see it as an innate psychic ability, since the warp is a place of emotions.
Dark Eldar suffer from constant draining of their souls to Slaanesh. If nothing is done, they become the "Parched", wasted and shriveled up, and eventually die. The previous Dark Eldar Codex talked of how the Parched lurk in the run down areas of Commorragh hoping to prey on an unlucky soul and thus restore themselves from their Parched status (The canonical Kabal of the Baleful Gaze is in fact made up of these lucky Dark Eldar that have recovered from being Parched). The ability for even starved feral Dark Eldar to feed strongly suggests this is an innate ability and not anything technological. The Dark Eldar compensate by feeding off pain and fear and use that to "top up" their constantly draining souls. In the 40K universe, the soul is a construct of psychic energy. By feeding, the Dark Eldar are able to use this energy to reverse the effects of physical aging, heal wounds, and otherwise empower themselves with greater physical bonuses. However as the latest Dark Eldar Codex has repeated, this physical youth hides the underlying gnawing insatiable hunger of the Dark Eldar. They are never sated because their souls are constantly being drained, and this effect becomes more apparent with age, meaning they have to feed on greater and greater numbers of souls or more extreme displays of atrocity to get the necessary amounts of fear and pain to regenerate themselves. Just like a thirsty person will be driven by instinct to seek out water and drink, the Dark Eldar are driven to feed.
The other varieties of Eldar do not suffer from this constant soul drain due to their different lifestyles, though their souls are still hunted down and consumed by Slaanesh if they are released into the warp. Because their souls are not being drained, they do not have that soul thirst. Their culture also puts such behavior as taboo.
Note: The soul thirst seems to be an effect of the Dark Eldar lifestyle, as a Craftworld Ranger in the BL novel Path of the Renegade that joins the Dark Eldar begins to feel the first stirrings of this. Similarly in Path of the Warrior we see a former Dark Eldar, now part of a Craftworld, with no signs of the soul thirst. One could interpret this to mean the Dark Eldar lifestyle is in keeping with Slaanesh's values and therefore the souls of the Dark Eldar become somehow more accessible and therefore susceptible to being drained while they are still alive. It is not solely the Craftworld Path system that protects, as we see Outcasts and Corsairs with no apparent need to consume souls.
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