My Useless Root Has An AFK Cultivation System

Born with a 'waste' spiritual root, Wang Yu's future in the cultivation world was a dead-end. Cast out by his family, he was brutally kidnapped and condemned as a 'spiritual slave' to the notorious Nilingxue Demon Sect. His grim destiny: to sacrifice his life essence, churn out spiritual sand, and slowly wither away for his demonic masters. Yet, Wang Yu harbored a secret: the [Placement Bar], a miraculous plug-in that allowed him to cultivate any technique 24/7, effortlessly, and without the soul-crushing side effects of the demon sect's deadly 'Blood Burning Kung Fu.' While others burned their lives, his power soared. Now, trapped deep within the heart of the demon realm, with his cultivation leaping forward at an impossible speed, Wang Yu must hide his escalating strength from the ruthless sect elders. Can a 'useless' slave rise to defy his terrifying fate and become the demon sect's greatest hidden threat?