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Demon Altar
Demon Altar inventory icon
Type Crafting station
Internal Tile ID: 26

Crimson Altar
Crimson Altar inventory icon
Type Crafting station
Internal Tile ID: 26
This article is about Altars in the Corruption or Crimson. For the altar located in the Jungle Temple, see Lihzahrd Altar.

Demon Altars and Crimson Altars are naturally-occurring crafting stations found mainly in and around Chasms in The Corruption or The Crimson, and less frequently underground. They are used to craft boss-summoning items and the Night's Edge. Altars emit some light, making them easy to spot. They cannot be freed, picked up, placed, or crafted. After a world enters Hardmode, they can be destroyed with Hardmode-tier hammers, but attempting to hit them with a hammer before Hardmode causes the player to lose half their health, and the Altar will not be affected.

Eight Demon Altars.
A world after smashing a large number of Crimson Altars leaving the Crimson and Hallow to spread.

Hardmode[edit | edit source]

After the Wall of Flesh has been defeated in a world, Altars can be destroyed with the Pwnhammer or any superior hammer. If a player attempts to destroy the Altar with a lesser hammer, or in a world in which the Wall of Flesh is not yet defeated, the Altar will be unaffected and the player will lose half their current health, as stated above. Each destroyed Altar causes one type of Hardmode ore to appear in the world, with the appropriate message displaying in the player's chat: "Your world has been blessed with (ore)".

  1. First Altar: Cobalt Ore or Palladium Ore, chosen randomly.
  2. Second Altar: Mythril Ore or Orichalcum Ore, chosen randomly.
  3. Third Altar: Adamantite Ore or Titanium Ore, chosen randomly.

Players will be able to find these new ores scattered across the Underground layer to near-Underworld levels, with them replacing any blocks created during world generation. They will spawn at random locations in varying chunks, in places explored and not explored alike.

  • Which ores are generated is not determined until an Altar is smashed. For example, it is not determined if the world has Cobalt or Palladium until the first Altar has been smashed. The same goes for Mythril/Orichalum with the second Altar, and Adamantite/Titanium for the third.
  • Subsequent Altars destroyed will begin the cycle again, though the fourth to sixth Altars will drop half as much ore as the first ones, the seventh to ninth will drop only one third of the ore of the first ones, and so forth. This "multiplier" can be calculated with the formula 1/(ceiling(n/3) + 1 - sgn(n)) where n is the number of Altars destroyed. So, destroying the 19th Altar would yield one-seventh of Cobalt/Palladium Ore compared to the first Altar.
  • Altars are still needed for crafting certain items, destroying every Altar in a world is not recommended.
  • Destroying more Altars will never spawn Hardmode ore types beyond the three that were randomly assigned to your world during the initial round of destroyed Altars. A world with Palladium Ore deposits will never spawn Cobalt Ore deposits, or vice versa.
  • No matter how many Altars are destroyed, ore rarity remains set with Cobalt/Palladium being the most common, followed by Mythril/Orichalcum, then Adamantite/Titanium as the rarest.
  • Each time an Altar is destroyed, one or two Wraiths spawn, regardless of the time of day. When destroying multiple Altars in rapid succession, the resulting Wraith swarm may become difficult to deal with.
  • Each time an Altar is destroyed, there is a 66% chance that a single random tile in the rock layer will be converted to Ebonstone/Crimstone or Pearlstone, facilitating the spread of underground Hallow or Corruption/Crimson. Only stone blocks can be converted in this way.
  • Additionally, smashing an Altar will start spawning mechanical bosses (until it's defeated, each has a 10% chance of spawning each night), and random Pirate Invasions (if all the criteria are met).

Crafting[edit | edit source]

Used to craft[edit | edit source]

Result Ingredients
Night's Edge.png Light's Bane.png Light's Bane
Blade of Grass.png Blade of Grass
Muramasa.png Muramasa
Fiery Greatsword.png Fiery Greatsword
Night's Edge.png Blood Butcherer.png Blood Butcherer
Blade of Grass.png Blade of Grass
Muramasa.png Muramasa
Fiery Greatsword.png Fiery Greatsword
Suspicious Looking Eye.png Lens.png Lens (6)
Worm Food.png Rotten Chunk.png Rotten Chunk (15)
Vile Powder.png Vile Powder (30)
Bloody Spine.png Vertebrae.png Vertebrae (15)
Vicious Powder.png Vicious Powder (30)
Slime Crown.png Gold Crown.png Gold Crown
Gel.png Gel (20)
Slime Crown.png Platinum Crown.png Platinum Crown
Gel.png Gel (20)
Slime Crown.png Gold Crown.png Gold Crown
Gel.png Gel (99)
Slime Crown.png Platinum Crown.png Platinum Crown
Gel.png Gel (99)

Hardmode Ore locations[edit | edit source]

A Crimson Altar in the snow.

Achievement[edit | edit source]

Achievement Begone Evil.png Begone, Evil!"Smash a demon or crimson altar with a powerful, holy hammer."
Smash a demon or crimson altar, using the Pwnhammer. Pc only.png

Notes[edit | edit source]

  • Altars cannot be collected as items.
  • Cobalt/Palladium is roughly twice as common as Adamantite/Titanium, with Mythril/Orichalcum halfway between.
  • Altars can be destroyed through other phenomena, such as being spawned on top of Sand or being struck by a meteorite landing. If the world is in Hardmode, an altar destroyed by natural causes will spawn ores normally; however, prior to hardmode, an altar being destroyed in this way will have no effect. This makes it possible to bless ores without a Pwnhammer or better hammer.
  • Altars encountered outside of the Corruption/Crimson on a given map will always be found at a depth of around zero feet. This can be seen at the Ocean floor, where altars can sometimes be found.
  • Altars emit a faint amount of light, making them somewhat easier to find in low-light environments.

Tips[edit | edit source]

  • Players about to enter Hardmode may benefit by mining paths to several known Altars beforehand, as navigating Hardmode Corruption/Crimson is dangerous at first.
  • On the rare occasion that an altar spawns on top of a Heart Crystal, the bottom two portions of the crystal can be broken for two separate items, while the top two portions remain unbreakable.
  • Stacked Altars will bless the world with 2 ores

Trivia[edit | edit source]

  • The difficulty that new players often face in identifying and determining the nature of Demon Altars, often resulting in forum posts asking about "purple spiky things", has become a notable social phenomenon in the Terraria community. A title message references this with the text Terraria: What's that purple spiked thing?
  • In some rare cases an altar can spawn on another altar. Hammering it in Pre Hardmode will deal damage and cause both altars to break.
  • An Altar can spawn on sand, breaking the sand beneath it will break it, ores will spawn only if it is Hardmode.
  • In some rare cases an altar can spawn on top of a crystal heart, causing the bottom half of the heart to be destroyed during the collection process, while the top half remains underneath the altar while also retaining its animation
  • A wraith is defined as a spirit seen shortly before or after one's death; their appearances when an altar is broken may imply that altars are indeed living creatures.

History[edit | edit source]

  • 1.3.1: Sprites updated.
  • Fixed the problem with altars/pots/chests spawning in bugged conditions.
  • 1.2.3:
    • Fixed dying by demon altar having no message.
    • Crimson Altar now shows up when you hover over it on the map.
  • 1.2: Worlds which have the Crimson instead of the Corruption will have Demon Altars replaced with Crimson Altars.
  • 1.1:
    • When smashed with a Pwnhammer during Hardmode, either Cobalt, Mythril, or Adamantite will be spawned in the world.
    • Now has a chance to summon a few wraiths and create an additional Underground Corruption or Hallow spreading point somewhere in the world when smashed.
  • Pre-Release: Introduced.
Furniture: Iron Anvil.png Crafting Stations • Candle.png Light Sources • Chest.png Storage Items • Pure Water Fountain.png Other Items