Board Thread:Lore Discussion/@comment-2165692-20160701070121/@comment-27025277-20160813210621

Magnus' energy flows from the sun, aka good. Perhaps, it isn't aetherius itself that vampires are weak to, but rather Magnus' influence on the light itself. I believe Sovrngarde isn't affected by Magnus and thus that is why Vampires can be in Sovrngarde without being harmed.

I believe that vampirism is bound to be expanded upon more in future installments. Dawnguard was the beginning of that. Just like I believe Lycanthropy will be expanded upon.

Bethesda has its unanswered questions, but it has the ability to expound onthese as well.

Patience my brother...