|Materials||Materials for the other two altars the player hasn't built, excluding the magic stone|
|Examine text||An altar of the occult, imbued with ancient, cosmic and dark magic.|
The Occult altar, also known as the Altar of the Occult, is built in the Achievement Gallery of a player-owned house as a place where players can switch their spellbook to one of the following: the Arceuus spellbook, Lunar spellbook, or the Ancient Magicks. Other players can use the altar, provided they have the requirements to access those spellbooks.
In order to build the occult altar, players must right-click upgrade from the altar they have built, with the required materials dependent on the altar built. For example, upgrading the Ancient altar to the occult altar will require 1 lunar signet, 10,000 astral runes, 1 Arceuus signet, 5,000 blood runes, and 5,000 soul runes.
- During development, the altar was called "Altar of the Gods".