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The Ourania Altar (also known as the ZMI Altar) is one of the several runic altars located throughout RuneScape. The altar is in the Ourania Cave, which is west of the Battlefield, and south of West Ardougne.
The Ourania Altar converts pure essence and daeyalt essence into an assortment of random runes. The altar, which requires no talisman, tiara or staff to enter, gives 170% the normal experience for each pure essence used. Rune essence cannot be used. Players do not need a specific Runecraft level in order to craft at this altar, but the chance of crafting higher-levelled runes increases with a higher Runecraft level.
Once inside the Ourania Cave, quickly reached by an Ourania Teleport (Level 71 Magic from the lunar spellbook), players may use a bank there that requires a payment of 20 non combination runes of any type. They can then go to the altar by taking either a short and dangerous route or a longer and safe route. Note that the long, curving path has no monsters. At the end of the long path, there is a crack that requires no Agility level to cross.
There are two paths you are able to take when crafting runes at the ZMI altar