Start with Half a Demon Pill? I Want to Be the God-Killing Demon King

[No system + passion + plot flow + decisive killing + slow heat in the early stage] Zhang Wuchen, who had been paralyzed for twenty years, stopped his heartbeat. He thought he was finally free, but unexpectedly traveled to a strange and bizarre world. The high wall of the Ten Thousand Zhang God Realm goes straight to the dome. Outside the high wall is the Chiyuan Sea of ​​Demons where demons are rampant. Inside the high wall are the terrified people of Zhongzhou. He only has half a demon pill, but it is enough to stir up troubles in both worlds—— Who said half a demon pill can't make you emperor? He doesn't! Who said that beyond the high wall there is no recovery? He went too far! Who said that the power of the gods in the sky is mighty? He prefers war! In this life, Zhang Wuchen stepped through the sky, killed demons and gods, and became the world-destroying demon king...