I recommend 'Cage of Despair' to you. This book is full of blood, death, and despair. In this apocalyptic game, people could only keep killing to survive, and the ugliness of human nature was infinitely magnified. The whole world was shrouded in an atmosphere of despair. After reading it, one would feel suffocated, heavy, and powerless. This was exactly what you needed, a book full of negative energy. I hope you like my recommendation, Mwah ~😗