@Liedral It was just an excellently crafted holy sword that a hero that was called the "Sword God" used, that everyone praised as this amazing holy sword. It's likely it was just overhyped or it's power had greatly diminished since the time of the Sword God or, the most likely I'd guess, the vampire that turned asshat noble #2 was some insanely powerful elder type vampire, so he isn't at the level of your standard vampire.
It's probably like when you're da vinci and your works are worth a ton. The doodle you made in the second grade may not be your best but it's still your work.
He acts like he is very powerful and he always has things under control, but his abilities are always described in such and undercutting way with a lot of limits. You get to learn more of what he can't do rather than what can do.