[Atgxtg]

I for making the single world concept Fantasy.

Sci-Fi would be best served with multiple worlds/star systems.

Otherwise I think the spaceships will overwhelm the magic. High tech weapon has a much greater range that magic.

There not too much a mage can do when the 16" naval guns open up while the Battleship is still 20 miles away. Even less if the "Battleship" opens up from is 500 miles away, while in orbit.