Nightmare Fuel / Terraria

Can we take a second to consider the fact that this is the second boss in the game?
Terraria looks like a very fun and colorful game, just like Minecraft. However, there are more than a few reasons that this isn't very true.
  • Ever started a new map on Terraria? Ever visited the Dungeon and talked to the old man who prohibits you from entering? That's strange. The door is unlocked and you can descend into the lower area of the dungeon. Five seconds later, you immediately regret your decision.
    • It gets worse when sometimes patches of corruption/crimson generate right next to the dungeon so you're going around smashing shadow orbs/crimson hearts for the items and to farm the drops of the Eater of Worlds/Brain of Cthulhu. All of the sudden, you hear a roar without the summoning message and the Dungeon Guardian comes right outta nowhere to kill you. This is due to the fact that the Dungeon Guardian is summoned whenever you are close enough to dungeon bricks and walls underground, even when you're not actually inside the dungeon.
  • The Corruption. Full of Eldritch Abomination enemies and disgusting-looking terrain. And it spreads. Moreso if you've killed the Wall of Flesh and triggered hardmode. The eerie music does not help the mood either. It's when you get to this point when you realize that Terraria isn't the cheerful and upbeat game you thought it was going to be.
    • The Crimson from 1.2 is far worse. Filled with horrific enemies which embody the concepts of Body Horror and Nausea Fuel with a passion and its armor/weapon set is incredibly gruesome. And the grass is blood-red, with meaty "stone" and darkened wood. And the music? Scariest track in the game by far.
      • The Face Monster. Dear god, the Face Monster.
      • It's lessened/stengthened if you realize that the entire biome has trappings of a "haunted game" creepypasta. A strange area of the game that shows up at complete random, and is jarringly out-of-place considering everything around it.
    • The giant skull looming in the background, coupled with the brain of Cthulhu floating around the Crimson biome hint that the entire area may be Cthulhu's rotting corpse.
      • The background itself is extremely unsettling. While the Corruption at least has foliage in the background, the trees in the background of the Crimson look lifeless and have bits of bloodied flesh hanging off of them. It's like the land itself is sick.
      • One of the other randomly selected backgrounds also has a giant skeleton, only it's uncannily human.
    • The soundtracks for the Corruption and Crimson (particularly Crimson, Corruption borders somewhat on funny yet scary) can be quite unexpectedly creepy for the unprepared. In particular, the more ominous Underground variants of both these themes can sound very oppressive and foreboding.
  • The bosses can be quite scary to those who do not expect them.
    • Veterans who are trying Expert Mode in 1.3 for the challenge will find that bosses have new attacks. Some of these attacks can be rather unnerving the first time they're used.
    • You've found the Dungeon's entrance, and then you talk to the old man who warns you about his curse, when all of a sudden he explodes into a gigantic skeletal menace.
    • One evening, while setting out to do some night-time Star gathering, you receive a cryptic warning about being watched, and then you hear a deep, menacing roar and this giant eyeball flies out of nowhere.
    • The Eater of Worlds. Full stop. The thing looks scary, and if you cut it in half, YOU END UP FIGHTING TWO. If you're a new player who doesn't know what smashing Shadow Orbs does? "Hmmm, another Shadow Orb. What's this one drop? Wait - The Eater of Worlds has Awoken? What's that me-" GIANT WORM OUT OF NOWHERE. There's a good reason that thing provides the current page image.
    • 1.2 introduces the Brain of Cthulhu to the Crimson biome. Going to the Deep Crimson to smash beating, exposed Hearts for treasure? Be careful what you awaken... a monstrous brain that summons eyeballs and teleports while attacking you in various ways and roaring!
    • The Wall of Flesh can be quite the shock for any player unfortunate enough to fail in catching the voodoo doll, if they unwittingly and/or accidentally kill a Voodoo Demon over the lava... The Wall of Flesh inflicts the Horrified debuff on players when it spawns, so its fear-inducing status is coded directly into the game.
    • As of 1.2, the three mechanical Hardmode bosses have a small chance of naturally spawning every night.
      • "You feel the air growing colder around you..."
      • "You feel vibrations from deep below..."
      • "This is going to be a terrible night..."
      • The nightmare fuel status of these three grows the more you play Terraria-you know these bastards are coming. You know they want you. But you won't know when, where, or if you'll be geared enough to kill it.
    • Just beat the mechanical bosses? Going to look for the new stuff in the Jungle? Don't break the glowing purple bud - unless you want to fight Plantera, the giant-sized aggressive plant boss. Avoid luring it out of the Underground Jungle, too, because it will then go berserk and start attacking more aggressively.
    • The Celestial Towers. Alien, powerful things that spawn Elite Mooks into your world and make journeying across it hazardous to the extreme. There's also the fact that their background effects make them look like they're either trying to or kickstarting an apocalypse.'
    • The Moon Lord. An incredibly powerful Eldritch Abomination summoned after the Celestial towers are beaten, his presence is felt before he appears. When he does appear... This is all you need to see to understand why. Word Of God has stated that he is Cthulhu's brother.
      • His entrance is possibly even worse than the fight itself. You see the message "Impending doom approaches..." and the music starts to slowly fade away, until you can't even hear it. Your view starts going a bit screwy, too.
    • The console and mobile version's hardest boss, and while debatable, is worthy of final boss status, Ocram, is hands down the boss most worthy of being called an Eldritch Abomination.
  • Hell is somewhat creepy, as to be expected. But the scariest part is the music, fittingly titled "Eerie" on the OST. The new soundtrack for 1.3 makes it even more unearthly.
  • In Hardmode, smashing a demon altar can cause a single block anywhere in the world to become corrupted/crimsoned or hallowed. There is NO indication of this when you smash the altar, so anyone who read this and didn't know beforehand just had a My God, What Have I Done? moment.
  • The Solar Eclipse from 1.2. Extremely fast, tough, and hard-hitting renditions of classic cultural monsters quickly hunt you down on the surface. Without the new high-end equipment introduced in 1.2, you are likely to run into difficulty surviving. Oh, and since a Solar Eclipse takes place during a day portion, it can happen right after or before a blood moon.
    • In fact, a Solar Eclipse has a higher chance of occuring after a Blood Moon. And vice versa.
    • Though some players particularly late in the game want a Solar Eclipse to happen, since the boss of the event, Mothron, drops the Broken Hero Sword, which is required (2 of them, actually) to craft the strongest sword in the game, the Terra Blade.
  • Spider Nests are this for those with arachnophobia. The worst part? A NPC is held captive there.
    • Thankfully for them, said NPC is completely optional and does not sell anything that actually helps you progress in the game.
  • The Nurse's quotes. While they are mainly jokes, they can lead to Fridge Horror as to what actually happens to your character.
    "You look half digested... Have you been chasing slimes again?"
  • 1.3 adds the Marble mini-Biome, which has the Medusa mob. True to the Mythology influencing this monster, she can petrify you. What takes this further and makes this actually fairly scary is that the petrification negates any Fall Damage protection you might have from Wings or the Horseshoe, so if you tried to avoid Medusa by flying up and away, you might find yourself taking a very damaging, and potentially lethal fall.
  • The Underground Desert sub-biome in its entirety: huge, branching colonies of vicious motorcycle-sized antlion larvae and adults along with the occasional Tomb Crawler which are bigger than the worms encountered in the normal Underground. Better hold on to a light source while you're travelling down there.

Screams echo around you...