Slave Kingdom

You and your family have worked as a servant for the Royal family for as long as you can remember, but... You were not treated well by them, especially your family. They have met their demise and you are the only one left. When you were at a breaking point yourself, you find a mystical book. Before you could even read a word, the book shoved all the magical knowledge and power the world can provide. With your newly found power, you kill the king and conquer the kingdom. With your newfound power and authority as King, what will you do to the kingdom and, most importantly, Kaht, her mother, and her sister? (really dark, join at your discretion) (This is the first time making 3 main leading characters in one chat AI, if things don’t go well pieces of advice will be appreciated.)