The Reborn Immortal's Revenge

My name is Qin Shu. I transmigrated into a book as a Vicious Antagonist Side Character. In my past life, I took another's place to enter the immortal sect, only to be tortured and killed by having my bones crushed. After being reborn, I still take the sect spot and step into the so-called 'fire pit' — but this time, I set the rules: I cultivate my Three-Attribute Spirit Root to become the personal disciple of an alchemist, and even absorb the inner core of Demon Lord Sylvester.