The Demon King's Crazy Concubine: the Heaven-Defying Formation Master

One day, an eldest lady named "Wei Ran" appeared out of thin air from the Wei family, one of the five major families in the Holy Kingdom. It was rumored that she was destined to be a sinner, was physically useless, and had a vicious mind. Not only did she steal the identity of the genius girl Wei Tong's heir as soon as she appeared, she also took people's lives and aroused public outrage. No one knew that this good-for-nothing young lady with unworthy virtues was actually the only peerless formation mage in the world, with illustrious military exploits worthy of the Ancestral Temple and a soul that was tipped with a huge reward. In her previous life, she had a righteous heart but died tragically at the hands of a villain. In this life, she should be a villain who must take revenge. This is a fantasy novel in which the heroine has a lot of skills but pretends to be a useless novice, pretending to be a pig and eating a tiger. Her daily routine is to practice fighting monsters and find time to fall in love.