It's the Vampire 6th Edition Army book, detailing the blood dragons.
I cannot remember if it was a grail, or Fleur de lys however.
As mentioned, there are many boons to being a Grail Knight - but rarely documented. It may well include protection against Vampirism - after all, there's no documented Dwarf or in particular, elf, Vampire that I'm aware of. With old, old elf magic, deriving from Isha, the mother, and giver of life blah, blah, being the influence behind the Breton magic which is the basis of the Grail might well protect those who drink from the grail.
I'd think it's unlikely, and especially unlikely to be able to stand against Abhorash. This mother fucker is around 4300+ years old. Something from the old Liber Necris book IIRC, is that not only is the older the vampire the more powerful, but it is also the older the generation (i.e, each blood kiss is a new generation, so those of Abhorash's get are the second generation, and those who are bitten by his spawn are third etc), and having recieved the elixir of nagash which is what created him as a vampire making him extremely powerful.
You then add that onto someone whose natural lifespan was that in the hundreds (as the aristocracy of Lahmia and Khemri at large was already), as opposed to the mid sixties in the case of Bretonnia before becoming a Grail Knight, and realise that Abhorash would have been fighting against Badlands Orcs back when they were a true threat (back in Sigmar's day) as well as Southlands Lizardmen, as well as probably Cathayan armies, and it's apparent that a Breton Grail Knight would rarely have the experience to survive such an onslaught - while it's not a particularly good example of such, as it's more hero hammer, but Gotrek and Felix were barely able to withstand a Vampire in Vampireslayer, despite Gotrek being essentially Grungni reborn.
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