A bard is a poet, especially of epics, a musician, storyteller, historian. They maintain the cultural stories of a society. Shakespeare is often referred to as "the bard," though the term is much older than him.
They probably just have 20 charisma. And a lot of bribing money.
Actually both of those things could seduce a dragon...
I don't know, I think "bard" is not an accurate translation in these exercises. It sounds too much like "poet" while the actual meaning, even given the sentences, is closer to, as somebody else mentioned, something like "prophet"...