All the way through and then he grabs it and auuugh... Translation: when it looks like Gajeel's winning the fight, Yomazu skewers his arm with his sword, to the point that the tip was protunding from Gajeel's shoulder. And then he grabs it and breaks it by bending his arm (which, by now, is bleeding like there's no tomorrow.
Wendy hanging out with a guy who looked like he was thinking about pushing her off a cliff. The Dissonant Serenity in his face.
During the Tower of Heaven arc, Juvia's screams as Vidalus Taka forcibly takes over her mind and uses her to attack Lucy. The Mind Rape overtones are not subtle in the slightest.
In Chapter 228, Juvia hears that Meredy wants to kill Gray. This is her response.
The ending of Chapter 249, when Zeref finally starts acting like an apocalyptic monster of legend.
Everything that Monsieur Sol of the Element 4 did to Elfman during their battle in the anime.
Merci la Vie in the anime: You are slowly being turned into stone (not even petrified; just turned into a shapeless rock) and at the same time forces you to revive the worst moments of your life forever.
Zero is really, really creepy. From the omnicide to how he beat up Team Natsu with a big Slasher Smile on his face.
It's not just a beat up: first, he totally dominates the both Natsu and Gray and knocks them senseless, then he briefly look at Lucy (who's frozen in fear) and knock her out too. Then he keeps beating them up and hitting them with his darkness magic, again and again, just for fun. Then there's his final spell, Genesis Zero, which unleashes a tsunami of shadows who tears the target apart by biting him.
The merciless beatdown Minerva gave Lucy in Chapter 291 is pretty damn horrifying to watch...
We see where she gets her cruelty from in Chapter 300. Jiemma, her father, is a MONSTER.
Let's just say both of them in general. They are bad enough that everyone in the guild is in a cold silence when they are angry, fearing for not only being kicked out of the guild, but for their lives.
The moment Sting truly snaps is rather horribly well portrayed too. He doesn't scream or howl, on the contrary, he suddenly falls silent and looks up with a blank stare as you realise that in that exact instant, Jiemma's life just became worthless to him.
Chapter 316: Minerva spent the time waiting for Kagura and Erza to finish fighting torturing Millianna. Her screams were music to her ears.
A herd of 10,000 dragons are coming to attack the entire Kingdom of Fiore. Oh, Crap doesn't even begin sum this up.
However, only seven of them got past the gate. Seeing how those seven were enough to give the best guilds absolute hell, image if it was all 10,000....
Chapter 318: Rogue being possessed by his own shadow!
Was ridiculously close to killing all of Fairy Tail's top-tier mages at the time without even trying.
It's an Omnicidal Maniac who sees other living things so beneath it, it prefers to just scorch them right on the spot instead of having a conversation.
It is revealed that it killed Dragons in droves and earned both the title of their ruler and being a terror to them. Bonus points in that it used to be a human.
Also, if you go back to just before the Edolas arc and listen to Gildarts explain how badly his fight with Acnologia went, just his tone and the grim look in his eyes tells you about how hellish of a fight it was, plus he was fighting the behemoth alone. It was a very brilliant piece of Foreshadowing for what happens at the end of the "fight" at the end of the Tenrou Island saga, unintentional or not. The dark music playing during that scene only makes it even more disturbing.
Simon getting his jaw blown off.
Gajeel as the Iron-Shadow Dragon Slayer. His appearance ring any bells? He looks like friggin' Venom!
Guttman Kubrick is surprisingly creepy for a Filler Villain. His appearance may be humorous, as a giant anthropomorphic giraffe thing, but something is clearly off with him and he gets sick enjoyment out of torturing others. His magic itself just causes pain by making your own magic—a part of you—explode. And then there's the fact that he can only communicate through Telepathy, which means he gets inside your mind and ...!
No matter how hilarious Zirconis removing Lucy's clothes was, you do have to remember, he's planning to eat her.
Chapter 334: The rather horrible way Gray apparently dies.
Chapter 335: On the first page, the mini-dragons are apparently eating Macao alive. And to make it worse, his son is right there! Also a tearjerker since Macao is assuring him that he's fine and telling his friend he leaves his son to him.
A Fridge Horror and sort of nightmare fuel, but Chapter 337: It is implied Future!Rogue's Start of Darkness involved Frosch's death. Then this chapter reveals it wasn't a death, but a murder. So who will take Frosch's life?
Chapter 340: There is something really unnerving about the look in Mavis's eyes when she gives Zeref the threat of annihilation if chooses to wipe out humanity. Yes, she gave a full-blown death threat.
I'm sorry, is no one disturbed by the fact that the man who can kill you with just a look is threatening to massacre every living being on the planet?
Chapter 348: As if the masked man's face wasn't bad enough, he wants to eat Gray!!
In Chapter 354 we meet a member of Tartarus who took out all of Succubus Eye using her power to turn them all into shriveled up, black, doll-things. Minerva shows up, and is scared as hell, and appears to be the next victim. When you can make readers feel bad for a Jerkass like Minerva, that's a scary damn villain.
And then in Chapter 356, we have another member of Tartarus named Jackal who single-handedly massacred the entire Magic Council except for Doranbolt, who was lucky to escape with his life, all while sporting a Slasher Smile that would give the entire Deadman Wonderland cast chills. And if that's not bad enough, all of Tartarus's higher-tier mages are demons from the Book of Zeref, and their Guild Master is none other than E.N.D., the most powerful demon Zeref has ever created, who even Atlas Flame was terrified of and supposedly even kicked Igneel's ass. Tartarus is really starting to make Grimoire Heart look tame by comparison.
Speaking of Jackal, in Chapter 361 (appropriately named The Two Bombs) has Jackal placing one of the surviving Council members and a pregnant woman inside of explosive spheres and then forcing Lucy and Wendy into a Sadistic Choice—choose who lives or who dies. What makes it horrifying is the way he just watches all involved squirm and plead for their lives, especially the woman who is pleading not for her life but for that of her unborn child and the Council guy who tells them the woman doesn't matter because he's more important—all the while Jackal is cackling and giggling in the background. Thank goodness Natsu survived Jackal's earlier attack, because if he hadn't...
The mere concept that the protagonists, barely over 20 even with the Time Skip, are coming across dead bodies of ex-Council members that require a Gory Discretion Shot for us...
Chapter 365: We see Erza tied up at Tartarus's HQ, completely at their mercy. And then, she's interrogated for Jellal's location. How effective is the torture? Turns out Kyouka can control feelings and increased pain sensitivity to maximum. It has Erza, one of the most powerful mages in Fiore screaming in agony and it reduces her to tears.
Kyouka decides that the shallow cuts she was torturing Erza with before aren't enough, and has moved to electrocution.
It's even more horrifying when you remember that the very reason Erza likes to wear armour is because of her trauma from Tower of Paradise. And now she is completely stripped, restrained and tortured, it's Tower of Paradise all over again, if not worse.
Chapter 382: That flying island Tartarus has as their headquarters? Use a curse called "Alegria", and it becomes a flying Eldritch Abomination that turns almost all of Fairy Tail to stone and assimilates them into the architecture of the guild hall. And this gets so much worse when you remember just how many other skulls, skeletons, and other assorted Scenery Gorn there are already built into the walls.
Chapters 383 & 384: Lucy is all alone with Lamy, Torafuzar, and Jackal all after her head. Even as she strains herself to open three gates simultaneously, she can only keep them at bay for so long. Eventually she's left defenseless from overusing her magic, and while willing herself to stand up, Jackal suddenly blows up her left leg, leaving her fighting back tears of pain while Jackal and Lamy laugh at her suffering. Then as Lamy offers to help Jackal finish her off, Jackal suddenly blows her up without a trace, horrifying Lucy. If not for Aquarius, Lucy would have suffered the same fate.
Even worse, before that Lamy suggested Jackal blow Lucy's breasts up Pure Gorn and for a moment it looked like he really was going to do it!
The "Face" magic pulse bomb looks really creepy, even without taking into account its purpose as a weapon of mass destruction designed to remove all of the magic from the continent. Chapter 387 makes it worse by revealing there are multiple Faces. A few of which are grinning. Who designed these things?
There are said to be TWO THOUSAND Faces. Wendy (who put everything she had into destroying ONE of them) starts crying out of sheer despair.
Chapter 390: The Reveal concerning Silver: he's actually Deliora possessing the reanimated corpse of Gray's father. To think he was originally portrayed as the nicest member of Tartarus too. The Slasher Smile he gives while explaining this only makes it worse.
The colored page at the beginning of the chapter shows that the scar on Silver's forehead was from a fairly graphic gash ironically created by the very demon now possessing him.
Also, the sheer DEATH GLARE Gray gives off upon hearing this would put anything that Erza's made thus far in the series to shame. Juvia gives a smaller one to Keith upon him saying that Gray's story would come to an end.
The final page of Chapter 390 has Gray reaching Unstoppable Rage levels as he charges with pupiless eyes while Deliora laughs maniacally; a horrifying change from the calm air he presented for most of his appearance.
In the end though, it all turns out to be a lie. Silver's just the Reanimated corpse of Gray's father. But we do get some Nightmare Fuel from Keith and his experiments instead. As well as the Skeletons he summons to bind Lucy.
Chapter 396 gives us Torafuzar's Curse ability, Tenchi Kaimei, which is a sea of black waters enveloping everyone nearby. Not only does it combine fear of the dark as well as drowning, it's also fatal poison to boot.
In Chapter 399 Acnologia returns and induces a Mass "Oh, Crap!" in everyone, even Tartarus and especially the Fairy Tail members, which is justified considering their past experience with it. Even Marde Geer is visibly nervous.