Charging air orbs
|Staff of air|
Wilderness sword 3 or higher (recommended)
|Wilderness Hard Tasks recommended|
|Inputs (1,149,120)||Outputs (4,057,920)|
|720 x Unpowered orb (166,320)|
2,160 x Cosmic rune (982,800)
|720 x Air orb (4,057,920)|
Air orbs are worth 5,636 coins, and are created by casting Charge Air Orb on unpowered orbs at the Air Obelisk. With an equipped air staff, this requires 3 cosmic runes per cast (or 1,365 coins). Using the Edgeville lodestone for banking, you can charge 27 orbs per trip (one inventory slot is needed for the cosmic runes), resulting in a profit of 109,080 coins per trip. You can also use a beast of burden to carry more orbs, but remember to leave 3 or 4 free spaces in your inventory, so you can swap between unpowered and charged orbs.
The Air Obelisk is located on an island in the Wilderness accessible via the Edgeville dungeon, or via the shortcut from the Wilderness with completion of the Wilderness hard tasks. Using the map on the right as a guide through the dungeon, the round trip to the obelisk, counting banking, takes approximately 205 seconds. This will give you roughly 475 orbs per hour.
If you have completed the Wilderness hard tasks, what you can instead do is take the agility shortcut on the south side of the altar, cutting out at least 50 seconds of travel time. Further time can be saved by unlocking the Wilderness sword 3, you do not need to bring this item with you, and it will save more time, bringing the hourly output to 720 orbs, or 105,040 coins per trip. This method takes you near the Mage of Zamorak, so beware of any PKers lurking nearby.
Bear in mind that running through the Edgeville dungeon places you in combat range of aggressive thugs, chaos druids, deadly red spiders, level 84 skeletons and black demons. The Air Obelisk is also located in the Wilderness, so do not take anything you are not prepared to lose.