Ever since I saw the first post for your syndicate supernatural agency au it has been floating around in my brain, I’m generally curious on what dream is up to and what the dynamics are.
For you I actually went and completed these omg. I am so happy you are enthusiastic about this AU! Believe it or not, Dream actually just guards the artefacts, defying any ill intention towards them because while most of the mortal world is unaware of their uses/abilities, some do.
Also think of Cornelius and Dream like magical girl troupe except in this case, Cornelius has no idea about Dream and Dream likes to keep it that way. They switch places/share one body so they cannot simultaneously appear in one place together though sometimes they can appear in each other's reflection. Dream is not hostile but because he kept to himself most of the time, he can be easily misunderstood!