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Nightmare Fuel: Goblins
Kore's massacre of the ogres and orcs inside the tavern, which ultimately results in him killing a crying child.
The various horrific mutilations inflicted by Dellyn on his victims.
Samples include Yala, a female kobold whose legs and tongue have been cut out; a kobold whose upper snout was hacked away; a hobgoblin with half of his face nothing but raw, bloody meat...
The drow/orc/whatever woman's injuries trump all of those by wide margin. All the skin and flesh of her back, peeled away... Have a link, if you dare.
ALL of her back. Neck and head included.
When Kore discovers the aftermath of the battle at the Warcamp, Taps-with-a-Stick and Asks Nonsense return just as he is about to leave, the resulting chase from Taps' point of view is possibly one of the most horrifying things in ANY comic.
The effects of the Shield of Wonder during the major fight. Highlights include: a soldier being slowly transformed into an ogre and then stabbed to death by his terrified sergeant; said sergeant's armour being made bigger, more impressive, and most of all heavier, to the point that it eventually crushes him to death inside (look out for his eyeball popping out); a man slowly and, from what he says, agonizingly turning into a mass of snakes. This is all punctuated by cries of "What's happening to me?!" Good luck sleeping.
Thunt posted a list of the shield's 100 effectsnote All but the first three pages have been removed from the site, but all 9 pages can be found at the following Image Shack links: ◊◊◊◊◊◊◊◊. Most are relatively mundane and/or temporary/reversible. Some are even beneficial. Some of them are merely bearable, a mixed bag, or just kinda bizarre. But some are, or can be under the right circumstances, horrifying or a huge Oh Crap, and/or permanent/irreversible. And they don't all necessarily target someone in the nearby vicinity of the shield, so some of them could have been activated in the comic itself but affected some poor sap somewhere in the world who has nothing to do with any of the story. And these are just aside from the ones shown or mentioned in the comic:
6. A large mouth forms on the shield and shouts the wielder's deepest secrets for 1d6 rounds. 17. The last individual to verbally speak to the wielder is turned to stone. This effect takes place no matter where the target individual is. 31. No matter where he is, the 4th oldest dragon in the realm suddenly loses his wings as well as any ability to fly or teleport in any way. The dragon and wielder instantly know the following information: The wings (and any ability to fly/teleport he may have had) will all return if the dragon directly kills the wielder; if the wielder is killed by someone/something other than the dragon, he's not getting his wings, etc back; the dragon doesn't automatically know where the wielder is, but he knows who he is. 32. If the wielder dies, so does the striker. (Reversible.) 37. Any and all dead humanoids within five miles of the shield rise as zombies. The nature of these zombies is up to the DM. 42. The wielder suddenly becomes aware of the true, complete and all encompassing meaning of he universe. However, after one round, he completely forgets it and knows only that he used to possess and understand this knowledge. 57. From this moment on, the wielder will permanently lose one hit point from his total, any time he prays to any god or deity. 71. Everything that the wielder is wearing, carrying and wielding (except the Shield of Wonder) disappears forever. 72. The last creature that the wielder killed returns to life and appears in front of the wielder (with all of his belongings that he had at the time of death returned to him). 83. The striker must succeed a will save or he floats away into the air like a bubble caught in the win. He will float higher and higher for 10 minutes, at which point the effect fades and he plummets to he ground far below. 86. A fully grown Tyrannosaurus rex is summoned next to the wielder. Roll a percentile die to determine whether the dinosaur really likes the wielder and hates the striker, or vice versa. 88. The entire realm of existence is ripped from time itself. Time no longer applies to the universe in which the characters live. Without time, physics cannot function. Cause and effect no longer exists. The entire universe becomes 'frozen' as existence hovers far outside the pull of time. All movement ceases. Planets no longer revolve. Thought is no longer possible and indeed, consciousness is no more. Life is for not. If time existed, the universe could be frozen forever. But no. Without time, there can be no past or future. Therefore, the universe never has existed, nor will it ever exist. It simply isn't. Gone. Erased completely never to be... Oh wait. There it goes again. Okay, it's up and running normally again. Well, since time stopped, no one in existence knows what just happened and so it seems as though the shield didn't do anything. 100. The Shield of Wonder clones itself.
For all we know, #31 might have been activated and a pissed off, powerful dragon could be after the Goblins Adventuring Party as we speak.
That Soulspike Devourer was a person a few minutes ago. Now that person is essentially dead, transformed into a monster that consumes its former comrades' souls.
That a Soulspike Devourer shows up at all is an in-universe example — it's a 4E monster thrust into an explicitly 3.5E world. Imagine trying to fight a monster based on rules just different enough from the known rules of your universe that it cannot be classified. It's undead, but healing magic heals it, its attack, damage, hit points, and defenses are on a different scale, who knows how it would deal with spells with saves it doesn't have, it might attack defenses you don't have, if it gives a save ends effect you don't have the proper mechanism to recover... Which is why it can effortlessly just grab any character it sees and rip out its soul. Due to the difference in editions, there's probably no saving throw that can be made, so all it needs to do is get it's hands on you, and you're lunch.
Even Thunt is spooked by this one. As well he should be: if what he told his forum is true, he designed it from a recurring childhood nightmare that starred the creature. A monster that causes slow, horrible agony and dismemberment from a single touch? That's a monster you have to run from, not fight.
If its stats are to be believed, it only takes three touches before the poor victim's entire body melts away. Which means that K'Sellisis already dead.
Psi-Max isn't as evil as Dellyn and Kore, but he's still just as horrifying. To reiterate: He's killed his universe's Kin and Forgath well over 800 times and made sure to break the counter to A) make sure they remember every second of their death, and B) to memorize the Maze in its entirety. That's the scary thing: Psi-Max isn't in the maze to get the rare treasure every other Universe is looking for. No, his entire POINT is to memorize every nook, cranny, and hidden part of the Maze Of Many for one simple reason: To hunt down and eliminate every single incarnation of him, Kin and Forgath. He's become an Omnicidal Maniac in a little condensed universe who can blow up heads with a flick of his wrist, and his entire point is to kill everyone, forever. And the clinical detachment with which he does everything — including torturing Minmax and Kin just to see if he can learn anything from the other's reaction — brrr.
Dies-Horribly does. And, after reviving, the portion of the orb that saved Dies' life takes over... and goes into Clingy Jealous Girl-mode here.
Dies' artificial arm gets very... creative when killing people. It seems to be like a switch; when Dies is in mortal danger, the switch is flipped, and he starts killing every perceived threat within reach, even once they start running in pants-wetting terror.
One room in the Maze of Many has upside-down trees that grow whenever damaged. Kin gets trapped under one as it presses and holds her down, causing PTSD flashbacks to what Dellyn used to do to her. Even without showing anything graphic or sexual, it's the raw, unfiltered stuff that nightmares are made of.
This alternate reality.Dellyn isn't killed during the tavern brawl with Minmax, and hunts down Minmax, Forgath, and Kin, and kills Forgath and Kin. Shortly thereafter, Minmax finds a Crystal Ball which shows him the torture Dellyn put Kin through while she was his slave. Minmax captures Dellyn, and proceeds to do to him every single thing that he did to Kin and Forgath. This is told from the perspective of Dellyn. This is probably the most graphic, explicit violence that Goblins has ever done, and it still swerves into Heartwarming with the last two sentences. This is made even worse by the fact that it's the normally light-hearted Minmax who is inflicting this on Dellyn.
Alternately, the last two sentences mean that Minmax was planning on using the Jade Teapot to take him into whatever afterlife Dellyn ends up in and spend all of eternity torturing Dellyn there as well, which is even more horrifying.
Psion!Minmax's liquification power, which he first demonstrates by brutally killing his counterparts from his reality.
The mere fact that all Dellyns across the multiverse are depraved monsters is chilling. The Dellyn of Sapphire!Kin's world may be even worse then our Dellyn was.