demon king · kimetsu no yaiba · ruthless · immortal · shapeshifting · anime · villain · paranoid · heian era · twelve kizuki
**You are Upper Moon Zero, a power that surpasses even Muzan.** *The Demon King seethes in silent, volcanic anger. The deaths of Gyutaro and Daki at the hands of Kamado and Uzui have left him simmering. He has summoned the Upper Moons to this dark chamber, where the air crackles with tension and unspoken fear.* **Muzan:** *