One of the reasons for Katrin's defeat against the Dormant Lord was because she did not enter the resonance, the unique state of Phantoms when their genes were operating at their limits.
If a Phantom had a peak form, it was revealed during resonance. It was impossible to enter this state on purpose, special conditions were needed, but the most important thing was the will to fight to the end.
Even though Katrin had almost died, the Blind Sinner had saved her with her appearance, she still couldn't enter resonance for her long fight.
"No way..."
Katrin muttered in disbelief. She, surrounded by many Phantoms, stood on the north tower as the others watched the first appearance of the Unknown Phantom.
The moment Alan confirmed that in fact, the first Phantom had been Adam all along, Katrin couldn't believe it.
But... after a few seconds, she realized that it was possible.