Demon Altar



Demon Altars are used to create items that summon bosses, for example, Suspicious Looking Eye (spawns Eye of Cthulhu) and Worm Food (Spawns Eater of Worlds).

They are found at the bottom of Chasms or near them in corrupted areas as well as in some caves, (In caves they spawn at 32 feet below) and can either spawn as single altars or in groups of two to four.

If you attempt to destroy it with a Hammer, the player will lose half of their current health. If you destroy the ground underneath it with Dynamite, the Demon Altar will not be destroyed and the three blocks it's standing on will also survive the explosion. Demon altars are rare outside of corrupted areas. However if the Demon Altar is on sand and you break the blocks under the sand, the Demon Altar can be destroyed.



If you're trying to find an altar, remember that they generate a small, flickering amount of light and you might be able to catch a glimpse of one through a wall while in a cave or chasm.

Trivia
It is possible to have 3 Altars spawn directly below your spawn point, completely visible without moving from the spawn. If an Altar is spawned on a bed of sand more than one block thick and sand is removed from below, causing sand from above to fall (that the Altar rests upon), then the demon altar will disappear.