[Twan]

Considering most versions of their myth, werewolves should be "ethereal" far more than vampires, as ethereal = resistant against normal weapons (and 25% of having a silver weapon already seem a big chance for a militia). A stake looks far easier to find.

edit : a cool ability to add for both vampires/werewolves/and some other powerful undeads or void creatures would be #nwimmortality : if killed by normal weapons / mundane dammage (only) the unit is immortal (eventually even out of dominion), but killed by magical weapons, spells or other kinds of dammage it remains dead (then a #silverweapon tag may be added also, making a weapon able to kill these units without having the to hit bonus and ability to hit ethearal beings of a magical one) - but of course this kind of restricted immortality is probably very hard to implement