After finishing her invisible jaunt around each floor of the building she finds a place to reappear before coming over to Leif. "I found some rooms we should check."
Spoiler: Investigation
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No ranks, can't try.
Leif, unable to detect magic at all, follows Yume to the best of his ability, as he could not wall-crawl.
"I don't understand what's foxish about walking on walls."