I am curious to know the story behind a vampire who is fiercely loyal to a city with a second sun designed to turn vampires to dust.
For those curious, he is loyal to the previous king, the vampire lord. The upstart theocracy are usurpers, but the city can be saved from them. He was a loyal praetorian guard of the previous ruler, before he got turned into a vampire. Then he followed him into vampirism.
He still has family, kids and grandkids in the city, but he himself was forced to flee when the guardian appeared in the sky. He still keeps in contact with his family.
I can't recall what is cannon and what is just IMC...the vampire lord was never killed, but lurked below the city, awaiting his chance to return. When arriving in Avernus, the PC discovered his old master is alive and was overjoyed. He is helping the vampire retake the city from the devilish incursion. Later on, he will have a point of conflict as the vampire king has no intention of letting the city leave Avernus. In Avernus there is no sun, and the people all turn to him as their saviour. If he goes back to the prime material, that all changes.