I always thought Elves were immune to being raised as undead.
Drow even make it a point to raise their own fallen into skeletons. Elves are still flesh and blood at the end of the day. Vampires just aren't common in general. So of course they won't be common among elves either. It only looks like it's most common among humans because that's where most games take place. But if you had a game set in an elf city with vampires nearby then I don't see why not.
It's already happening in Spellforce 2, Skyrim, Neverwinter Night 1, Baldur's Gate 2... There's PLENTY of proof that elves are affected. And no book stating otherwise is going to change that simple fact.
If this is done very skillfully, it's invisible to the player.
Actually, it's the opposite. If something "just exists" with no good reason then it's shoe horned in. So it shouldn't be invisible at all. Reverse that logic. A gameplay mechanic should make sense in the game world/setting. Currently we don't know. Which we'll probably find out later. Likely because the "bad guys" wanted it that way to make sure the party reaches them, for whatever reason. If that's the route it's going then that leaves the "why" of it all.
