The creapiest suggestion I've heard (from here, can't remember whom) is that they need the blood of the living as their lubricant.
I remember seeing that myself- that IS creepy.
I have a tangentially related PC concept I've roughed out in 3.5Ed & 4ED- Hellbox. He's a fusion between Hellboy and a LeMarchand Box from Hellraiser, designed to be a living gateway to the lower planes.
The 4Ed version:
What I have for Box so far:
Box, a.k.a. Hellbox
Hybrid Battlemind/Warlock
SKILLS:
Arcana
Athletics
Intimidate
Power Points: 2
LVL 1 POWERS:
Eldritch Blast (W)
Iron Fist (B) (Augmentable)
Bull's Strength (B) (Augmentable)
Flames of Phlegethos (W)
I'm still undecided about which Feat to choose first- Hybrid Talent to get the Battlemind Armor would improve survivability; WP Spiked Chain is appropriate for the PC's flavor, but isn't crucial to the early levels; Ritual Magic is on the list- I want him to be able to incorporate his own components (even though I can't make the spiked chain into one). And, of course, there are other options.
That same kind of mentality could go into figuring out the Vampiric Warforged. As mentioned upthread, a 'Forged whose creation included necromantic energies could very well fit the mold!
Or, perhaps he's more like Christine* from the Steven King story...
* or Killdozer, or the animated machines from Maximum Overdrive or Trucks...
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