Nightmare Fuel / Dungeon Fighter Online

• Puppet Museum. Notice every one of the statues of Dungeon Fighters you beat into oblivion? Every single one was a human Dungeon Fighter. Just. Like. You.
  • As a Brick Joke, Serpentina has the aforementioned statues in her room at the Abandoned Mine, and can also summon them.
• GBL members were all mind controlled by Lotus, which can happen to you unless you wear a particular item which requires a protracted quest to get. This item is not required to do actual dungeon runs against Lotus but has some neat special effects.
  • You actually do end up mind controlled by Lotus at some point in the story, and you end up murdering poor Lenny as she tries to snap you out of it.
• Various Metastasis areas have elements of this as you visit areas that were affected by it, most of them being formerly peaceful areas.
• The Reshpon, Village of Pain dungeon, unlike many other dungeons, the background music is a slow and melancholic piano track in contrast to the many upbeat or dramatic rock themes. The dungeon is mainly a dark empty village filled with re-animated corpses infected by Delezie's Black Plague.
• DFOG's Jane Doe event during July 12-July 26 2016 involved Delilah and Gabriel being randomly replaced with a Stringy-Haired Ghost Girl whenever you complete a dungeon, to make it worse, clicking on her has a random chance of her jumping out towards you!
• The Invasion on 8-bit event has you saving a pixelated "Strange Seria" from an equally pixelated Natram. Roughly one in three times, Strange Seria's sprite will start glitching out and zipping out of and into the screen, which is already slightly unnerving in and of itself, but Jane Doe rarely appears in her place every once in a while.
• The Harlem update introduces the Kashipa criminal organization, which (among other things) runs an extensive slave trade and regularly abuses or outright kills them for disobeying. Even their own members are not immune to getting killed by their superiors if it suits them.
• The final boss of the Harlem area, high-ranking Kashipa member Ricardo the Heartbreaker, is a walking example of Nightmare Fuel by himself. He's not even an Apostle! Looking much like his Cyphers counterpart except younger, his portrait features a grin that just borders on a Psychotic Smirk - fitting, considering he kills and takes whatever he pleases. This gets taken up to eleven when a video cutscene reveals that Cyphers!Ricardo is really just a host for the real one, who then proceeds to rip through his host's chest cavity from the inside with his bare hands! As if that weren't enough, he can do this to the player!
• Pandemonium War, a raid-like dungeon with the Kashipa in the spotlight, has every boss featured in the Harlem area and Operation: Hope turned into robots by the former Empyrean Kartel Mad Scientist Gizel. Well, almost everyone - White Rust Sisely (the female Mage with the rabbit doll) got turned into... whatever the hell this thing is. And given all the forbidden experimentation she's done, it's likely that she did that to herself.