From when Denethor had seen my strength in person he had been driven by a passion, an unexplainable passion to reach me.
The way the activation of the conceptual worlds work was very easier. However, even easy is easier said than done.
To simply put one just had to defy the norms with their desire and backed up by actions. It was synonymous to surpassing limits, only difference is that you don't actually surpass limit but receive an open door to a world of limitless possibilities.
And for Denethor, he had an unbreaking will to grow stronger and had unknowingly gained access to the strongest conceptual world without even realizing or knowing it.
Mercedes found his case utterly interesting.
'To think, I would find another person who has entered one of the worlds immediately after reaching his home. I was right to follow him...'
She smiled while Denethor still awaited an answer.