I Have a Demon Suppression Prison

Li Tianxing transmigrates to another world and gains a dream-born Demon-Suppressing Prison that can grow stronger. By suppressing demons, he receives cultivation rewards that steadily boost his strength, while the prison itself also evolves.

From then on, Li Tianxing becomes a righteous cultivator, praised by everyone for his hatred of evil. The cruel, cunning Green-Headed Demon? The blood demon with crimson hair, red eyes, and boundless killing intent? The Iron Demon, impervious to blades, spears, water, and fire? Hmph! I, Li Tianxing, will suppress every last one! No matter how many demons come, I fear none. I’ll turn them all into cultivation gains! Li Tianxing becomes a master demon-suppressor, roaming the world and subduing countless demons.

Until one day, he discovers that demonic cultivators might count as demons too? Fine, looks like he’s added another service to his list.

Then, one day, Li Tianxing makes an even more astonishing discovery: the inner demons that appear during tribulation… are demons too! Heh, heh-heh. Li Tianxing smiles to himself. From then on, as he roams the world, he carries a new sign: Inner Demon Slayer, Never Misses!