Nightmare Fuel / The Storage Papers

• The Grinner. His Sesquipedalian Loquaciousness, unnatural mannerisms, and perpetual Slasher Smile are utterly terrifying. Then you get to learn what he actually is: a powerful demon with limitless powers, including the ability to brainwash people and devour souls. Not to mention what he does to the poor schmucks he manages to induct to his cult of brainwashed followers, the Order of the Divine Ones.
• The giant praying mantises from "Cocoons". Not only are they sentient, but they can perform some kind of brain surgery on escaping victims that leaves them compelled to lure more prey back to them. And they're still lurking in the California mountain range, and there's no mention of what happened to Mikaela, who got said surgery, in the witness report.
• "Unmarked" shows one of Project Hydra's experiments first-hand, and it isn't pretty. At all.
• The undead ghouls from "Halloween 2020", and the graphic description of what they do to their victims.
• "Bait" has Ron's plan against the Grinner out into action, and it does not go as planned. Father Black is mutilated, Father Michael is possessed, subject to Body Horror, and then dies of Possession Burnout, and Preston Nicholson is horrifically killed. Then the Grinner notices Jeremy and chases him throughout the church, taunting him and threatening to brutally murder him.
• "The Cold in the Cabinet" has the infant Eldritch Abomination living inside the titular cabinet, which Jeremy theorizes to have been a nightmare trying to make its way into the real world. It's no wonder Ron decided to burn it.
• "The Licker" has a teenage girl tormented by the titular creature over the course of several days, with no one believing her, until the Licker eventually drives her to embrace being taken by it. Jeremy reveals that it also took her brother and mauled her father to death, and points out that there's almost certainly more of them.
• "The Duct-Tape Man" is about a man's slow descent into insanity, which is even more terrifying since it's entirely possible this was entirely mundane.