Ruins

The Ruins are the last remnants of a forgotten subterranean civilization. The entrance to the Ruins are in the Caves. The Ruins have their own theme, terrain, and biomes with unique creatures, statues, plants, and theme music. The Ruins have six different Biomes: Abyss, Labyrinth, Military, Sacred, Village, and Wilds ( also has a separate Atrium area). Earthquakes will occur in the Ruins, dropping the same minerals as in the Caves. The ruins have no Cave Lights and no indication of a Day-Night Cycle.
In Each Cave connects to a different Ruins world. Each Ruins is generated as a new world upon entering it, just like Caves. The Ruins can only be entered through a plugged Sinkhole found in the Caves. Ruins Sinkhole plugs are made of orange Thulecite. Upon mining the Thulecite plug, a rope will lead down to the Ruins through the Sinkhole, and Batilisks will spawn from the hole into the Caves at night. The Thulecite sinkhole is usually guarded by Spilagmites and Cave Spiders or a Rabbit Hutch village and it can spawn at a random place at any biome most likely at Stalagmite Terrain biome or sunken forest biome. Mine-able resources in the ruins are never renewed.
In , the Ruins are located on the same level as the caves and connected to the Mud Biome by the Lichen Meadow, often approximately opposite the Blue Mushtree Forest and Ancient Archive. The ruins (only one) are generated with the rest of the Caves level. All the materials mined in the ruins can be "reset" or repopulated by killing the Ancient Fuelweaver and waiting 4 minutes (see below).
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== Exploration ==
In , the starting area of the Ruins is surrounded by four massive pillars and four Broken Clockworks, with a rope leading up to the Caves. The Ruins are completely dark, causing a steady drain on Sanity. Unlike the caves, the ruins are considered to be in a state of perpetual night, since creatures and plants will act accordingly. As the Ruins are explored, sections of the map will show new icons and terrain specific to the Ruins.  The Ruins are also colder than the caves, especially if it is raining.
== Nightmare Cycle ==
The Ruins exist in a state of flux called the Nightmare Cycle, which can be measured by the Thulecite Medallion.  As the magical state becomes more intense, the likelihood of earthquakes increases. Its current state will affect the state of objects within it. Nightmare Lights will begin to open up, Runic Turf will glow red, and Ancient Statues will have a horrified look with Nightmare Fuel leaking from their mouths and eyes. Shadow Creatures can attack the player regardless of their sanity level during the most intense stage. This is a great way to collect Nightmare Fuel, but is a bit overwhelming at an early stage in the game. The runes on the ground do not provide a light source despite glowing brightly.
== Creatures ==
The following creatures can be found in the Ruins:
* Depths Worm
* Shadow Creatures
* Slurper
* Splumonkey
* Dangling Depth Dweller
* Damaged Bishop
* Damaged Knight
* Damaged Rook
* Ancient Guardian
Friendly damaged Clockwork Monsters can be made "Followers" by repairing Damaged Clockworks with Gears.
== Features ==
 Some of the ground and pillars in the Ruins are made out of a special material that starts to glow when light is shined upon it during the Nightmare Phase. The Military and Sacred biomes are mostly covered in this material. Also somewhere in the ruins there's a labyrinth, filled with Dangling Depth Dwellers, Ornate Chests and dead ends. At the center of this labyrinth resides the Ancient Guardian, who most players will challenge to get its rare Horn.
Unlike Caves, surface plants like Evergreens, Saplings, Berry Bushes, Spiky Bushes, and Flowers are not found in the Ruins, although the player can still plant these items. Plants will regenerate after a few days of being harvested (except for trees). The only plants that can be found naturally in the ruins are Light Flowers, Cave Banana Trees, and Ferns. Lichen is also exclusive to the ruins. Blue Mushrooms can be found here as well, usually in copious amounts.
Objects found in the Ruins include Relics, Ancient Statues, Nightmare Lights and the Ancient Pseudoscience Station. Relics can be attacked and destroyed for various loot while Ancient Statues can be mined to yield Thulecite and various Gems. Nightmare Lights can emit light and spawn Shadow Creatures depending on the Nightmare Cycle, while the Ancient Station will be used to craft some of the best items in the game, found in the Ancient Tab. Also in the wilds, there are Splumonkey Pods and special Ponds. The ponds can be fished in to get Eels.
Within the entrance of the Ruins, corpses of the Chess Monsters can be found. When destroyed, they yield 1 Frazzled Wires, as well as potentially Gears and other trinkets.
== Reign of Giants ==
In Don't Starve: Reign of Giants, the temperature of the Ruins depends on the temperature of the overworld.
== Don't Starve Together ==
In Don't Starve Together, the Ruins were moved to the same level as the Caves. This was done to avoid the necessity of a third dedicated server to hold it on. The Wilds biome can be found connecting to various cave biomes, as well as the ruins. An area full of Cave Lichen as well as Slurpers serves as an indicator of being close to the ruins. There are also several new ways for entities to spawn. 
In A New Reign, the Atrium Biome was introduced. The Atrium Biome is completely separated from the main land and is only accessible by either killing a Big Tentacle found randomly within the caves, then jumping into its Tentacle Pillar Hole or by using a Lazy Explorer. Once the player makes it to the Atrium Biome, they must pass the Obelisks which will be in a closed state unless the player has less than 15% Sanity. Players must be careful to never go above 15% Sanity, otherwise they will be trapped on the island.
When the sanity is low, the Resting Horror can be found sitting on a Relic Chair.
=== Regeneration===
If the Ancient Fuelweaver is killed, the Ancient Gateway will start to destabilize. After 4 minutes, the gate will respawn biome-specific resources (including Damaged Clockworks, Splumonkey Pods, Slurpers, Depths Worms, Ancient Statues, Broken Clockworks, and Ancient Pseudoscience Stations) in their respective places of the Ruins, add new items to Ornate Chests or Cave Holes, and replace the Large Ornate Chest with an Ancient Guardian.
Objects regenerated by the Ancient Gateway explosion.
Twenty days later, the Gateway will accept the Ancient Key to be placed again.
== Trivia ==
* The Ruins were introduced in The Stuff of Nightmares update.
* Since the release of the Ruins had to be pushed back, the Slurper was made able to spawn in regular caves until The Stuff of Nightmares update, which made the Slurper a ruins-only creature, as intended.
* According to Maxwell, an over-use of fuel from the Nightmare Lights led to the downfall of the civilization that once lived in the Ruins.
* Without mineral eating mobs like Rock Lobsters and Slurtles, any minerals generated by earthquakes will amass over time. This can cause lag, if they aren't removed.
* Prior to the Don't Starve Mega Update, when using a Teleportato in a Hamlet or Shipwrecked world, the Caves and Ruins would be erased and ready to regenerate.
== Bugs ==
*When dying in the Caves or Ruins, exiting the game right at the moment of death will cause the Cave or Ruins world to reset. Upon reloading, the player will spawn in a new Cave or Ruins world and lose all items.
**This bug can be exploited to make rare non-renewable items such as Green Gems and Thulecite renewable without using the Wooden Thing or Seed of Ruin. This bug works only if the player doesn't have any resurrecting structures active.
== Gallery ==
The Stuff Of Nightmares.jpg|Ruins as depicted in the poster for the The Stuff of Nightmares update.
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Category:Gameplay
Category:Lore