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In the final outcome of the battle that she's in, be it victory or defeat, she will "transcend matter" and be "restored to her eternal form" until the next time she is drawn to any conflict in the physical plane. The true Mercurial reasserts her control over them all as she does battle. At the height of battle, her identity shatters and reconfigures, forming the duplicates that we see in her Haunt ability. Irresistibly drawn towards conflicts in the physical plane, she is forced to take on a physical manifestation to participate. Mercurial undergoes an endless cycle of manifestation and ascension.
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Technically, this means that her real form outside of her physical manifestation is imperceptible to the mundane senses.
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In the clash of combat, her identity shatters and reconfigures, and she begins to regain awareness. While her normal spectral state transcends sensory limitations, each time she takes on a physical manifestation, she is stricken by a loss of self-though not of purpose. Just as higher states of energy seek a lower level, the Spectre known as Mercurial is a being of intense and violent energy who finds herself irresistibly drawn to scenes of strife as they unfold in the physical world.
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