There are many ways to earn more Runescape gold; one of them is by selling Air Orb. Air Orb can be created by charging the Unpowered Orb into the Air Obelisk. Other than the Air Orb, the Unpowered Orb can also change into other elements depends on what type of Obelisk you use to charge.

 

Unpowered Orb to Air Orb = Runescape gold

Requirements:

• Unpowered Orb (buy as many as you can)
• Cosmic Runes (buy as many as you can)
• Air Staff

Be sure you have enough Runescape gold buy as many Unpowered Orb and Cosmic Runes as you can. Before you enter, equip the Air staff first then proceed to the area where Air Obelisk is found.  Go to the Edgeville and find the trap door – besides the yews and coffins. Walk along on the north; ignore the skeletons until you found a door.

 

Continue to the north-west, climb the ladder where you found a Black Demons. Finally you will found an Air Obelisk. Click the Obelisk and choose the option “Charge Air Orb”. You don’t need Runescape gold to charge the Unpowered Orb since it’s free.

 

Convert all of your Unpowered Orb into Air Orb. After that, teleport back to the Edgeville. Put all your Air Orb into the bank. After that, repeat the process until you are satisfied. Once your finish, you can now sell all of your Air Orb on Grand Exchange for Runescape gold.