Thu 30 Jun 2022, 12:08
Not sure if it is helpful, but I have recently been looking at this and have found the "Undead" art book very useful to get general flavour and the old GURPS "Blood Types" sourcebook to aid with how these might work in gameplay. What I have noticed is that despite the numerous types of "vampires", the Revenant (from the core book) and the Glaistig (from the Britain sourcebook) are both good bases to work from (with some modifications).
I really like that powers and conditions can be very descriptive in the main part when creating or modifying vaesen, which helps to put something together quite quickly that suits your table and setting.