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

The town was a graveyard of the living dead. Amidst the chaos, they found a young deputy, Jenna Olson, terrified and clutching a shotgun in the local hospital. She was protecting a newborn baby—a girl whose mother had succumbed to the darkness moments after birth.

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 [S11E1] Out of the Darkness, Into the Fire

Dean swung a tire iron, the metal clanging against her skull, but she didn't drop. It took three more hits to ground her. He stood over her, chest heaving. "These aren't demons, Sammy. They’re 'Rabids.'" The town was a graveyard of the living dead

Suddenly, a woman emerged from the ditch, her movements jerky and unnatural. Her skin was a map of dark lines, and when she looked at them, there was no humanity left—only a primal, screaming hunger. She lunged. If you want to explore more about this