I think there is Dhar in the foundation of all vampires, in the elixir, the fact that all of them can eat Dhar at need seems to support that, after all the stuff most likely to draw Dhar in is more Dhar.
They don't draw in Dhar though, according to what we know. They suck up the nearby Winds of Magic with a 'vortex in their souls'* when they're hungry enough and in the process it becomes Dhar which they can use to sustain their souls but it alters them. I think there's something similar implied with Strigoi eating too many animals and taking on animal characteristics, which may be from incorporating Ghur into their souls, or might be the animal souls themselves.
The Elixir may or may not be Dhar based, we don't know. It might just be based on sacrificial magic using 'pure' human life force/bits of souls.
* I wonder if the souls of vampires is anything like a Waystone, which can also draw in the Winds of Magic. Wild theory time - vampire souls are like a miniaturised version of Nagash's Black Pyramid, which is also like an enormous primitive Waystone, but both lack the functionality to keep the Winds distinct like a true Waystone. A superior model of transhumanism than a vampire could be developed if you knew how to do so. Or, more pertinently for Mathilde, if you could selectively automatically draw in a single Wind.
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