To make the Air Battlestaff you'll need Staff of Air, Cosmic Runes Unpowered Orbs Amulets of Glory, Stamina and Energy potions. Find 81 Cosmic Runes and 27 Unpowered Orbs from the bank before heading the Air Obelisk. Charge your orbs, and RuneScape Gold then be able to teleport to Edgeville using an Amulet of Glory. Now you are able to combine staves that are charged with orbs to make Air Battlestaff.
To use Fire Battlestaff (Red one): Fire Battlestaff (Red version) You will require Staff of Fire and Anti-Dragon Shield. The runes you need are osrs equipment buying sites Cosmic, Law, and Dust. You will also need Unpowered Orbs, Stamina Potions, and Antipoisons. Additionally, Rune Pouch might prove useful.