The Lightning Thief - The Mist

“Okay, that’s extremely cool,” I admitted. “But what if a mortal sees me pulling out a sword?”

Chiron smiled. “Mist is a powerful thing, Percy.”

“Mist?”

“Yes. Read The Iliad. It’s full of references to the stuff. Whenever divine or monstrous elements mix with the mortal world, they generate Mist, which obscures the vision of humans. You will see things just as they are, being a half-blood, but humans will interpret things quite differently. Remarkable, really, the lengths to which humans will go to fit things into their version of reality.”


- The Lightning Thief, Chapter 10