Terraria's Nightmare World

Terraria's Nightmare World
The Terraria's Nightmare World is a world that has the seed: "Nightmares" naturally generated. Typing in this seed will not activate the world for some reason. Leaving the world will result in it deleting itself. This world can also only be created on October 31st.

The Terraria's Nightmare World is a world that is a sort of Terraria Creepypasta. When generated, you will spawn inside of a Living Tree. There won't be any guides and the grass grass is completely black. The sky is a very brightened red color. The background will be that of the crimson; even if your world is corruption typed. There won't be any entities spawning on the surface of the world. The surface is also continuously repeating itself. There aren't any jungles, Beaches, Deserts, or any other biome except for the one you have spawned inside. Instead of there being stone blocks underground, it is a very dark red crimstone. This block is not mineable with any pickaxe except for picksaw and above. The Living Tree does extend down, and thats the only source of making it to the underground. No ores spawn, and underground you will sometimes see reddish lights roaming around. The Living Tree goes underground for twice as long as a normal one would; making it to almost halfway to the Underworld. As soon as the Living Tree ends, you will be greeted by an enormous cave. It is similar to the caverns, and made out of a completely black, unbreakable block in stead of the crimstone. Still, no ores spawn. However, this is where you will meet the entities.

The Caverns
The caverns is the first layer to house entities; the second being the supposed underworld. These entities are normal in appearance, but when injured, have animations and get injuries on their visuals. They also make infamous and extremely dark sounds, like roaring in the distance or scratches. You may hear footsteps from behind your player sometimes. Your character may also begin to have visual effects of tearing up and getting scared. Occasionally in this lair, you can get the Blackout debuff, and an undocumented debuff called "Turn Back". This debuff icon shows the character and a black silhouette standing behind them. This debuff inflicts 5 health every minute. Sometimes, you may find tunnels leading deeper into the ground and I'd warn you to NEVER GO INTO THEM. Going into the tunnels will lead you to the Underworld, or whatever is in place of the Underworld.

The Underworld
The Underworld appears the same, except for the background. The background is darkened. You may occasionally hear roaring in the distance. The entities here are dangerous, deal a lot of damage, and look nightmarish. Their names are also glitched out when hovering your cursor over them. The "Turn Back" debuff will now be titled "I Warned You". Your character will have a scared expression, and often jumping up or backwards. The debuff you have will now deal 10 damage every 30 seconds, which technically quadruples the amount of damage you were gaining. Every structure in the underworld is made out of a reddish-greenish lihzahrd brick block, which is unobtainable with paint. After spending 5 minutes in this biome, the chat will say; "The Wall of Flesh has awoken..." in a dark red color, although you haven't thrown in a voodoo doll. The map does not show the Wall Of Flesh's icon. Rather, it shows a depiction of red, floating eyes slowing hurtling towards you at a similar speed to the Wall of Flesh. If you see this enemy, it will look like the Wall of Flesh but with realistic eyes and a realistic mouth. Once it sees you, it will suddenly begin to move at hundreds of miles per hour. As soon as it hits you, your character will explode and the chat will say "Goodbye, foolish explorer..". Then, your game will crash as soon as your respawn and the world will be deleted. from your save file.

Aftermath
After your world is deleted, you can still naturally generate the world and replay it. However, nothing will be out of the ordinary. Only your first time playing the world will be effected. Your Terraria save files will have one thing left over. It reads "This is not over yet, you will find me soon... AND I WILL DESTROY EVERY LAST ONE OF YOU WHEN YOU DO...". This is probably a message from the entity that was in the undocumented debuff. This also means that he may be lurking on anyone's world... at any time.