After Handcrafting a Nuclear Bomb, I Mechanically Ascend in the Cultivation World

How can a little girl with no dantian cultivate immortality? No problem! Flesh is weak, so let’s ascend through machinery! First I’ll build guns, then intelligent puppets. Now, what was the principle behind rocket launchers again? Didn’t expect that, did you? I’ve got a mech too! Your protective immortal artifact may be powerful, but what will you do if I bring out my anti-spiritual-energy disintegration ray sniper rifle?