```
The diary did not record the reason for Yingyi's appearance.
Heine guessed he was most likely dealing with the previous elf disappearance case.
But he did not enter through the vent, instead, he somehow opened the brass door left by Sabellia.
The diary did not record what the two talked about.
It only mentioned that afterward, this place became Barry's "lair."
It seemed to require some kind of ceremony to complete, for which Yingyi provided enough supplies.
After that, the door was almost forever sealed.
The two "inlets" next to the vent were added only after that.
Every so often, supplies would be delivered.
These included both living supplies and experimental materials.
Although Barry didn't become a Lich, after creating his lair his aging process was greatly slowed down.
So, he spent his days experimenting, providing elves with an endless supply of shapeshifters.
Some in the hall were successes, others failures.
