At entrance of that area, there is a teleporter, you will spawn on surface and there might be 1 Blazing Fire Elemental next to you already because he spawns close to it.
The Fire Overlord can be spawned in the North part of the sphere.

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The Fire Sphere is the Sorcerer's part of The Elemental Spheres Quest, to get access to it you'll need to use 20 Small Enchanted Ruby on the Mysterious Machine located in one of the Ivory Towers.
Spoiler ends here.

Fire Sphere, surface
Blazing Fire ElementalBlazing Fire Elemental450650
Blistering Fire ElementalBlistering Fire Elemental13001500
Fire OverlordFire Overlord28004000

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