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The main RuneScape Wiki has an article on: Charge air orb
The Old School RuneScape Wiki also has an article on Charge air orb.
Charge air Orb
Charge air Orb.png
Released 18 March 2002 (Update)
Pay-to-play Yes
Quest needed? None
Staff needed? None
Magic level 66
Description Needs to be cast on an air obelisk
Runes 3 Cosmic, 30 Air
Experience (?) 152
Fatigue Unknown edit
Casts / 100% (?) Unknown edit

Charge air orb is an enchantment spell used to convert unpowered orbs into air orbs. The orb is then attached to a battlestaff to create a battlestaff of air.

The spell requires carrying the unpowered orb in your inventory and then casting the spell on the obelisk of air, located in the Wilderness and accessed from the Edgeville dungeon.