I found them!!
I made a copy of my save, abandoned, exported the legends data and used
Legends Viewer, did an advanced search for Historical Figures, with the criteria:
Active Interaction - contains - DEITY_CURSE_VAMPIRE
and - Race - Equals - Dwarf
Got 25 results, checked all of them:3 last settlements were in Human Towns
1 last settlement was in a Human Hamlet
1 last settlement was in a Dark Fortress that had more Dwarves than Humans than Elfs than Goblins... go figure...
1
last settlement was in a Goblin Dark Fortress13 last settlements were in other Dwarven civilizations's Mountain Halls
2 began wandering the wilds after their last settlement in other Dwarven civilizations's Mountain Halls
1 began scouting the area around another Dwarven civ's Mountain Halls after settling there
3 last settlements were in one of my Dwarven civ's Mountain Halls (but a different group)
1 of these is the QUEEN of my civilization: The Living Gate of Meditation, with a name like "Onul Noblecrypt" I should have guessed it...
So from this we can conclude that:a) Even dwarven vampires hate elfs to the point of not settling in their sites... lol
b) My only chances of getting vampires are those 3 vampires in my civ? 2 (including my queen) live in one Mountain Halls and the remaining one lives in a different one.
c) All 25 are alive, I checked if there were any dead ones and there weren't, since I abandoned my fortress I can assume all the dwarves living there, are for the effects of the Legends snapshot I took, currently dead?? so this confirms I have no vampires in my fortress right?
Checking my abandoned site, and the dwarves that lived there, it says that they became a refugee in some ocean...?? so they are alive after all....
since all dwarven vampires were accounted for and none had "became a refugee in xxx" at the end of their event log I think this reconfirms I have no vampires....
d) in the criteria you can also search for:
DEITY_CURSE_werebeast
SECRET
SECRET_ANIMATE
does it work the same for the werebeasts? if you don't have historical weredwarves figures in your civ you get none?
what about the other tags? for necromancers? how does it work?
For the necromancers to siege you you have to embark within 10 region map's tiles around a tower, in your neighbors will appear "Tower", interestingly it doesn't show with the red "-----" can you trade with necromancers??
Checking my legends I noticed that 2 of my civilization's Kings went to live to a Tower, and some of the dwarves in my settlement have nicknames in the legends while most not (I nicknamed everyone)... will check some more and report back...