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At the end Elayne learned more from Rose than Rose learned from her. Apparently she just loved talking about herself and ended telling her about her past, her upbringing, her growth, and even about the Vatican, monsters around the world, and the other "Supernatural" people out there.
They were composed not only of people capable of wielding magic, but there were also supernatural bloodlines with powers that were like magic but worked beyond such constraints. Families of hidden superhumans that competed against one another for territory and riches, while also hunting down the monsters, which had always existed in the world, apparently.
Although on very few and smaller quantities than now. Old monsters were rare, at most there would be at least three or five big monsters per area, unlike the hundreds of monsters that may now exist within areas of the world as the days keep going after the First Contact.
Check "The Protagnist's Sister Is Actually the Strongest"!