[s11e1] Out Of The Darkness, Into The Fire [SAFE]

If you want to explore more about this specific era of the show: The psychological bond between Sam’s secret struggle with the Rabid infection Castiel’s torture at the hands of the angels

The sky above the Impala didn't just go dark; it bruised, a deep, oily purple that bled into the horizon like ink in water. Sam and Dean Winchester stood by the hood, the ringing in their ears finally fading, replaced by a silence so heavy it felt physical. They had just released the Darkness—an ancient, primordial force—and the world didn't end with a bang. It ended with a breath. [S11E1] Out of the Darkness, Into the Fire

"It’s a localized infection," Sam whispered, hopping out of the car to inspect a fallen road worker. "Whatever that smoke was, it changed them." If you want to explore more about this

In the quiet of a darkened hallway, Dean looked down at the baby. He felt a pull, a strange, magnetic tether he couldn't explain. He moved the infant’s blanket aside, and his heart stopped. There, on the baby's tiny shoulder, was the mark. The Mark of Cain. It ended with a breath