DM's Guide to Immortals: Elemental Creatures

Each race of elementals has an Immortal sponsor and protector, called an Elemaster.

Elemasters are high-ranking aides who serve the Full Hierarch of their corresponding Sphere.  They represent and rule all of the elementals of the multiverse.

The Elemaster of Fire (Hierarch 2) is known as the Firemaster (described in IM1 "The Immortal Storm")

The Elemaster of Earth is known as the Earthlord (described in IM1 "The Immortal Storm")*

*Land (Empyreal 2), second in command to the Earthmaster, is described in IM2 "The Wrath of Olympus"

The four Elemasters achieved Immortality long ago, and protect their exalted positions by preventing other true Elementals from reaching Immortal status.

Illustration from Dungeon Masters Companion

Creatures of other elemental races are capable of reaching Immortality, each within their corresponding Sphere.

These races include the haouu and sshai (Air/Thought), horde-beings* and kryst** (Earth/Matter), helions (Fire/Energy), and hydrax and undines (Water/Time).

*N'Grath (Eternal 3), a horde being who achieved Immortality, is described in IM1 "The Immortal Storm"

**Urtson (Temporal 5), a kryst who achieved Immortality, is described in IM2 "The Wrath of Olympus"

Of the djinn (Air) and efreet (Fire), only their rulers, the pashas and amirs (respectively), may strive for Immortality.