Tiaral

Well, personally, I would choose oratory (probably), but you should decide what suits the role-playing better. It's hard to judge, considering I don't know much about large-scale battles.

Added 1 minute ago

You could also not give up on the vampire card... The question is, do you want to?

Vampires don't have any beliefs. Unfortunately. There's an automatic rejection of the card. But, as I already wrote, I liked the idea with a vampire until I thought it was too far-fetched. It turned out it wasn't.