The Dark altar is built in the Achievement Gallery of a player-owned house as a place where players can switch their spellbook to the Arceuus spellbook. Other players can use the altar, provided they at least have 60% favour with Great Kourend's Arceuus House.
The lowest level at which the altar can be built is 75 Construction, using the +5 boost from a spicy stew. The crystal saw cannot be used to lower this requirement, as the Achievement Gallery room requires 80 Construction and is unaffected by the saw.
|Item||Exchange price||Total price|
|10 x Limestone brick||2,240||3,381,956|
|1 x Magic stone||984,716|
|1 x Arceuus signet||N/A|
|5,000 x Blood rune||1,670,000|
|5,000 x Soul rune||725,000|
- The book on the altar contains morse code, which can be translated as "darkness corrupts".
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