Gun. A weapon that originally existed on another world commonly called 'Earth' and used the mechanism of explosions to channel a projectile through a thin and narrow tube.
It was originally brought to this world by a visitor thousands of years ago but due to its limited use in this new world, it was all but forgotten.
But after her encounter with it, Katarina decided to see if there were ways to improve it and decided to do some research.
And after some experiments, she managed to find a way to inscribe magic circles into the tiny bottoms of the bullets thereby overcoming the weakness guns had.
After finishing all that, she sent it to her research group for improvements and after the modifications it had undergone, the final product was in Sylphie's hands.
KT001. That was the name of the gun she held in her hands.
...
"Fire." Sylphie took aim at the opponents head and a streak of light flew but as it shot towards Eliza.