Yeah, somehow. They were able to drink on sleeping people as vampire bats do, drinking small amounts of blood that can be considered sufficient.

I did always wonder how much blood did a vampire need to drink to be "full". In Oblivion and Skyrim, not much. Yet in Skyrim we see piles of bodies in vampire caves, and pieces of human bodies and organs on plates.

Could be more of a game oversight, as that would suggest Movarth has also mutated from Cyrodiil vampires as well since he was directly turned by one then he should have there exact abilities. But can see how you guys came to that conclusion.

Yay, i'm not the only person who thinks Vampirism and Lycanthropy are supposed to be a Curse wrather than a (Ooh, free attributes) o.o
but at least they gave somewhat of an explanation to Werewolves not being tied to the moon, apparently the companions are a different branch of werewolves that those Witches put on them.

Perhaps vampirism evolved over the centuries? Nords being resistant to disease, contracted the Cyrodiilic strain and thus infected others and so forth.

Just throwing crazy ideas out there.

Vampire powers should all be the same during all stages but feeding reduces weaknesses

Saw some people asking about improvements to vanilla vampires. I've mentioned this elsewhere but it's valid here as well, and I think there are. I spotted a couple of interesting terms in the Vampire Lord perk tree/constellation; Blood Magic and Night Powers. The perk in question reduced their "cost" by 33%. This suggests that the normal vampire powers (if they're retained at all, they'll probably be boosted slightly so they're actually useful) are being shifted from the once-a-day basis to a more typical spell format. This is good. I like this. But this IS just a guess. It'd make sense that they'd revamp (hoho) the whole thing to fit with this new stuff, rather than leave all that useless vestigial nonsense nobody uses (who honestly uses once-a-day powers? I only ever use Berserk or Highborn) behind to get in the way.

I get the impression vamps and lycans were kinda underdeveloped in order to get the game out for their prolific release date, and that this DLC is a way of tying up loose ends. Good worksmanship right there (not even being sarcastic for once).

Edit; just realised the title of the topic >_> I open loads and then just read, don't judge.

Yeah I wonder how much they need to be full as well but when we walk into vampire lairs I would assume those vamps just don't care and are completely at the mercy of their thirst and monster like nature. More creature than human basicly. Seems to be the most likely of reasons to me.

I want to marry Alva, hear me Bethesda?!