After comprehending the first complex Archaic Syllable of Eni, Kieran's Fabrication progress broke the threshold required to propel the Trial Completion percentage past minimum acceptance criteria.
Leaving the Ancient Rune Oasis would be impossible without reaching this point in the trial because, despite coming this far, Kieran couldn't perceive the slightest hint of the Veiled Arcadia Gate's whereabouts.
There was a reason finding the gate was the last objective of the trial and not the first. It would only become apparent once the trial challenge has fulfilled the prerequisite, which in this case was the completion rate.
〈System: The location of the «Veiled Arcadia Gate» has been revealed. Approach gateway before the complete deterioration of your «Mystic Rooted Tether» occurs.〉