You couldn’t just barge into ponies’ dreams – you’d wake them up. There were ways of getting in through force, true, but they would need to be very close and very familiar, making such means a terrible form of trespass. No, to enter dreams, you had to mould them, shape them from the outside, get the pony to invite you in, and even then it was hard to control the dream, hard to prevent the pony sensing you and becoming lucid and waking. It was even harder to learn anything about the pony. You couldn’t steal their secrets in dreams, but you could have them reveal them to you, trick them into telling you, showing you without knowing. It was a subtle craft, so very delicate.