The Astral Altar may be found to the south-east of the village on Lunar Isle. It is used to craft astral runes from pure essence, providing 8.7 Runecrafting experience. It can also be used to pray at and change to the Lunar spellbook from any other spellbook or back to the normal spellbook.
Unlike most altars, the Astral Altar does not need to be entered. As such, a talisman, talisman staff, tiara, or the Wicked hood is not needed. However, the Lunar Diplomacy quest must be completed. Players should take caution for the suqah that are en route to the altar.
Currently, the fastest way to get there is to used the Wicked hood's teleport by feeding it adding an omni talisman or tiara, which could only be used 2 times, or 3 if all the Wicked robes have been purchased from the Runespan. The second fastest way is to break an astral altar teleport tablet. Both of these methods teleport the player just outside of the altar. The wicked hood can be obtained by talking to Tam McGrubor, and the teleport tablets by playing the Great Orb Project.
The maximum likely limit for crafting Astral runes in one visit is 506. This would be achieved by having 82 Runecrafting, giving a 2x bonus, and carrying 253 essence to craft (23 in the normal inventory along with 48 in the 5 sizes of Runecrafting pouches, along with 175 claimed from the wicked hood (if all the Wicked robes have been purchased, and 7 from any abyssal summoning creature), whilst wearing an explorer's ring (which has a 1 in 10 chance of producing an extra rune per essence). The maximum possible experience is 2,201.1 obtained while doing the above.
- The astral altar and the Ourania Runecrafting Altar are the only two located altars that do not require a talisman, tiara, or talisman staff to enter, because both were established by the Moon Clan, who flattened the pocket dimensions into real space.
- Many players who wish to switch from ancient magicks to normal will use this altar because it does not drain your prayer and it is easy to access with a lyre or even faster with a suitably charged Wicked hood.
- If a player clicks "craft rune" or "pray" at a distance from the altar while running, when you pray or craft astral runes, the graphics quality lessens just for a moment, and returns to normal. This has not been fixed.