Can't Kill What's Not Real

"Oh, that looks painful. How bad is it? On a scale of agonising to excruciating?" Castiel screwed his eyes shut, gripping his stomach. His breathing was shallow as he gritted his teeth and cried out in pain. His stomach burned, and his head thumped. "I can make things so much worse Castiel. You could have left us alone! But now we're myths... and you can't kill a myth."