|Dimensions||3 wide ˣ 2 high|
After the Wall of Flesh has been defeated in a world, Demon Altars can be destroyed with the Pwnhammer or Hamdrax. Each destroyed Demon Altar causes one of the Hardmode ores to appear in the world. If a player attempts to destroy the altar with any other 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.
Smashing Demon Altars always results in Cobalt, then Mythril, then Adamantite ore being generated. Smashing a fourth/seventh/etc. Demon Altar resets the sequence to Cobalt, and continues to cause additional Hardmode ore deposits, thus increasing the distribution of the Hardmode ores with each successive time the player smashes a Demon Altar. Each time a Demon Altar is destroyed, 1-3 Wraiths spawn, regardless of the time of day. When destroying multiple Altars in rapid succession, the resulting Wraith swarm may be difficult to deal with.
 Used to craft
- Demon Altars cannot be collected as items.
- Demon altars generate less and less new ores as more are destroyed. The second set of altars create 1/2 as much ore as the first set, the 3rd set creates 1/3 as much as the first, and so on.
- On a Small map, Cobalt ore spawns below a depth of 760 feet (380 tiles), Mythril spawns below 1,000 depth (500 tiles), and Adamantite spawns below 1,400 depth (700 tiles), 100 feet (50 tiles) above the depth at which Lava begins appearing.
- On a Medium map, Cobalt ore spawns below a depth of 1,100 feet (550 tiles), Mythril spawns below 1,400 depth (700 tiles), and Adamantite spawns below 2,130 depth (1,065 tiles), 170 feet (85 tiles) above the depth at which Lava begins appearing.
- On a Large map, Cobalt ore spawns below a depth of 1,270 feet (635 tiles), Mythril spawns below 2,000 depth (1,000 tiles), and Adamantite spawns below 2,930 depth (1,465 tiles), 420 feet (210 tiles) above the depth at which Lava begins appearing.
- Cobalt is roughly twice as common as Adamantite, with Mythril halfway between.
- Each time a Demon Altar is destroyed, there is a small chance that a single random tile of stone in the world will be converted into ebonstone or pearlstone. This will more than likely grow to become a new underground Hallow or Corruption if given enough time.
- Demon Altars encountered outside of the Corruption on a given map will always be found at a depth of around zero feet.
- Players about to enter Hardmode may benefit by mining paths to several known Demon Altars beforehand, as navigating Hardmode Corruption is dangerous at first.
- If you destroy every Demon Altar in a world, it then becomes impossible to use them for crafting (at least within that world). Leaving one that's easily accessible in your world might be wise, although you can also create a new world and use Demon Altars there for crafting.
- 1.1: When smashed with a Pwnhammer or a Hamdrax during Hardmode, either Cobalt, Mythril, or Adamantite will be spawned in the world. Also, it now has a chance to summon a few wraiths and create additional Underground Corruption or Hallow spreading point somewhere in the world when smashed.
- Pre-Release: Introduced.
|Adamantite Forge • Alchemy Station • Bookcase • By Hand • Cooking Pot • Demon Altar|
Furnace • Hellforge • Iron Anvil • Keg • Loom • Mythril Anvil
Sawmill • Tinkerer's Workshop • Water • Wooden Chair • Wooden Table • Work Bench