I'm simply going to reply to one of the points of your post, so you can
understand what I'm saying when I speak of the lack of Light in
Vampires. Mayhap you have not heard of Lord Rahn's power, Illumination?
One of the things granted us by His will is the ability to "Shadow"
someone, the ability to remove all Light from a person. When someone is
"Shadowed", they are harmed by sunlight just as Vampires are. Not having
any light of their own, the Sun lends some of its own.

Searoth Thetis

Penned by my hand on the 22nd of Severin, in the year 131 MA.