Resonance, the power of harmony between three Sigils. In the past, she had attempted to create a single Sigil resonance but that tipped the balance in her body, leaving a permanent side effect.
If Resonance was the harmony between three Sigils, then couldn't she do the same with her Personal Artifact? Especially since it has the passive effect of adaptability.
If she were to imbue each form with a different Sigil and force a harmonic reaction between all three, wouldn't that be the same as a Resonance? All three forms grant her an aspect of control over the Void.
Should she succeed in fusing all three, it would give her dominion over the forces of the Void. On top of that, since it used the basis of resonance as a reference rather than her risky single Sigil resonance based on the ability of beasts, it should be far safer to execute.
But considering her current predicament, there was no point worrying about safety when her life was at stake.