The Demoness Cultivation Plan

I was once a demoness, so this isn't baseless or random. [Transformation + Hardcore Cultivation + Mildly Disturbing Settings + Slow Burn + Plot-Driven] In this world, the art of mechanisms is highly advanced, and all cultivators enter the Dao through puppet techniques, making cultivation extremely expensive. Lu Li, who transmigrated here, is penniless. He vows to resist excessive consumption and refuses to be the Immortals' leek. Even if it means death, he won't borrow a single spirit stone. Absolutely! Until—he meets an old lady in a ring, and from then on, at the cost of mortgaging his blood, bones, flesh, and organs, he magically modifies his body and falls into the demonic path... Mortgage skin, loan [Azure Nether Skin] — "Bro, your skin is so fair." Mortgage bones, loan [Glazed Jade Bones] — "Bro, your skeleton is so small." Mortgage palms, loan [Sumeru Puppet Hands] — "Bro, your hands are so small, let's compare sizes." Mortgage vocal cords, loan [...]