The System Changed the Side Effects: The More I Practice Evil Arts, the More Excited I Get!

Cultivating orthodox techniques with mediocre aptitude, he spends three years at the Qi Refining stage with no hope of ever making something of himself. Kidnapped and made into a human cauldron, he cultivates demonic arts and awakens a System. The side effect leaves him impotent? The System activates and changes the side effect to gaining a mighty phallic weapon... The side effect is burning through his life force? The System activates and directly extends his lifespan... The side effect is exploding and dying? The System activates, and every time he explodes, his strength increases by one level.