Basically, they can use their powers to form another body. Like Iceman, whose powers are ice, can become a being of pure ice/water. Or Gambit, who charges inanimate objects with kinetic energy, can become a being of pure kinetic energy. Jean is complicated because she is the host of the Phoenix, so her omega potential is probably tied to Phoenix's powers rather than her own telekinetic/telepathic abilities. On the other hand, her and Scott's son, X-man, would become a being of (I'm guessing) a some sort of psychic energy that does tie in to his telekinetic/telepathic powers.
Essence is the correct term though (to account for Jean), but usually a mutant's powers factor into their essence, so it is a major part of their omega-ness.
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