This is an Alchemy Cauldron!

"Old man?"

He poked his head around the door of the third floor. He wanted to call said "old man" something else, but didn't dare to do so.

"Come in."

He then walked inside.

"It's really cool in here," was the first thing that came to mind when he walked inside the third floor. It felt completely different from the scorching hot day outside after the rain. The room was so cool that he felt like he was in an air-conditioned room.

He looked up.

That was a huge red pearl embedded on the top of the third floor. It could also be seen from the outside.

It was only then that he understood that the pearl was meant for absorbing heat. The very reason why the third floor was so cool was due to that pearl's presence.

The coolness in the air had a faint fragrance to it.