The Fire obelisk is used to cast the Charge Fire Orb spell; the spell must be cast on the obelisk, not on the orb in the player's inventory. It is used for enchanting an unpowered orb into a fire orb (requires level 63 Magic), which gives 73 Magic experience. At level 62 Crafting, a fire orb can be attached to a battlestaff to make a fire battlestaff, granting 125 crafting experience. The Fire obelisk is located in Taverley Dungeon near the Black dragons.

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