In the far future, the galaxy is in turmoil

Science fantasy

This universe is like ours, but as Humanity progressed through the ages, so did our self-importance and bigotry. We conquered planets and subjugated many alien nations, until one day, resistance had enough.

Same as ours, through a big bang.

The same as our universe, however there is a magic system. This system is more scientific than others, as magic is considered to be a form of energy like light or heat.

Magic energy flows everywhere throughout the galaxy, and gravity plays a part in how it travels and its density in certain regions. The only entities capable of utilizing magic energy are known in the galactic tongue as "casters." Casters can only cast a spell if the density of magic around them is capable of being converted into it. Casting many spells at a time will greatly exhaust a caster. It is possible to die of fatigue by casting too many spells in a single moment.

There are no spellbooks in Galactosk. If there is magic energy, casters may utilize it in any form they can imagine, depending on the density of magic, of course.

Depends on individual planet progess.

So far, the number of casters that have died of fatigue by casting too many spells is around 3,000,000,000,000 (three trillion.)

Star Wars, Star Trek, Starship Troopers, Warhammer 40k, Stellaris (yes, really)