Authentic Triumph

is the Noble Phantasm of Zenobia.
A Noble Phantasm whose True Name can only be released when she is truly convinced in her heart that she "has proven that she is an ideal queen", or that she "can prove it in this coming battle". It cannot be invoked if there is even the slightest doubt.
By devoting all of her Magical Energy, her force of will, her willpower, her determination, her fury, and her pride, the golden chains that are so deeply ingrained to her Spirit Origin as a Servant can be disintegrated, a form saying “IF I desire it――― I can dispel the defeat and disgrace that the Roman Emperor Aurelian forced on me, and the Queen of the East will attain her victory!”. That is the form that she attains.
It is not only a physical liberation of her body, but a spiritual cleansing of the imperfect past of Zenobia.
In other words, the Servant who is now a Shadow Servant has denied the possibility of “the imperfect Zenobia, whose cowardice covered her, and who begged for her life”, the equivalent of a conceptual substitution that repaints her own existence temporarily.
When this Noble Phantasm’s True Name is released, Zenobia’s overall status will achieve a most marvelous improvement.Fate/Grand Order - Zenobia Profile, translated on Reddit by Justiciar Jyggalag
==References==
Category:Noble Phantasms
Category:A+ rank Noble Phantasms
Category:Self-Control Noble Phantasms
Category:Noble Phantasms introduced in Fate/Grand Order