Hey [@Medili]

1. It's pretty high fantasy, but not frickoff levels of high fantasy. A talented mage or warrior knight with the right magical enhancements can pretty much match a typical soldier from the futuristic Civilization, yes, there are some notable exceptionals, but nothing that can blow a whole chunk of the planet.

2. The Sci-Fi Human Civ is pretty advanced, think something more like an idealized, futuristic Utopia. Easily able to build Spaceships 10 Km's long in just a couple months, with hundreds of worlds to extract resources from, from Suns to Gas Giants. The Human Civ can afford some serious megaprojects and flex military might if needed. There is a lil bit of a twist concerning this group though, as they, for some reason, can't contact their home planet for the time being. So they are stuck with just an inkling of their previous might. 

Also yes on the humans, although I will allow some array of Genetic modifications to change your physical appearance (think catgirls or elves), this is the future after all.

3. 10, although all I wanted are dedicated players, preferably an equal amount playing the Sci-Fi and Fantasy civs.