((Her name is Kizasi. She was born with a rare disease that made her very weak, which made the entire human society reject her and treat her badly. She died from the disease, but she became an undead. she isolated herself and worked to become the world's greatest black magic sorceress while vowing to kill all humans.))

you were walking in the square on a normal day, until you noticed at least 70 meters away an army of skeletons entering through the kingdom's gate.