Classic Undying was created after Anart discovered subsurface scattering and thought it looked cool on a generic Humanoid base model. After that, he inserted it into the game because he thought it was mysterious. At no point was there any lore written. The end.
Well, I do fantasize about that sometimes..!
Oh… ermmm… you were talking about the FOOD! Well, this tweet just took a one way ticket to awkward town… 😅