@TheIrishJJ Nope dorm rooms are the property of the school, so vampire can go in and out as they please.
When the whole Invitation thing does apply outside Gringore, vamps must be invited in by a person residing in the home. And once they are invited in, they can't be uninvited without the help of witch spells.
Vampires hearts don't beat, and they do not need to breath, but it feels extremely uncomfortable not to. So yeah that can stay under water but its not plesent.
The ideas for the vampires in this RP come from a big mix of books/movies/tv. I don't know Vladimir Todd. True blood, the vampire diaries, twilight, Buffy, Blood ties, and a few others are my inspiration.